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Glossary for Concentration difficulty

Medical terms related to Concentration difficulty or mentioned in this section include:

  • ADD: Attention Deficit Disorder (ADD) is a mental and behavioral disorder characterized by behavioral problems such as hyperactivity, inattention, concentration difficulty, and other mental symptoms. The related description Attention Deficit Hyperactivity Disorder (ADHD) may be a more modern description of the disease.

    Misdiagnosis of ADD is a well-known controversy in the sense that cases of hyperactivity in children may be over-diagnosed. There is a tendency for parents to seek and doctors to prescribe the drug Ritalin even in cases where the diagnosis of ADD or ADHD may be incorrect. Alternative diagnoses include normal child behavior (i.e. just an active child), food intolerances, or other behavioral disorders (see misdiagnosis of ADD).

    On the other hand, ADD is under-diagnosed in adults, with a large number of adults having ADD without knowing it; see misdiagnosis of Adult ADD.

  • ADHD: Attention Deficit Hyperactivity Disorder (ADHD) is a mental and behavioral disorder characterized by behavioral problems such as hyperactivity, inattention, concentration difficulty, and other mental symptoms. Typically, ADHD and associated hyperactivity is known as a childhood disorder, although ADD/ADHD in adults is known to be under-diagnosed. It is distinguished from Attention Deficit Disorder (ADD) which has a reduced focus on hyperactivity type symptoms.
  • Achrestic anemia: Achrestic anemia is a form of anemia similar to that caused by Vitamin B12 deficiency but it doesn't respond to treatment with Vitamin B12. The condition tends to progress slowly and can result in death if not treated. There are a variety of possible causes.
  • Acute Alzheimers-like concentration difficulty: maybe to due to various causative agents
  • Acute concentration difficulty in adults: maybe to due to various causative agents
  • Acute concentration difficulty with headache-like symptoms: is mostly due to an organic cause
  • Acute difficulty concentrating at work: is mostly related to stress
  • Acute difficulty concentrating for long periods: concentrating difficulty which occurs only during particular periods
  • Acute episodic concentration difficulty: concentrating difficulty which occurs only during particular periods
  • Acute feeling of having difficulty concentrating: maybe due to stress or an underlying neurological lesion
  • Acute seasonal concentration difficulty: concentrating difficulty which occurs only during particular periods
  • Adenosine triphosphatase deficiency, anaemia due to: Deficiency of a chemical (adenosine triphosphate) resulting in anemia.
  • Adhd: Attention Deficit Hyperactivity Disorder (ADHD) is a mental and behavioral disorder characterized by behavioral problems such as hyperactivity, inattention, concentration difficulty, and other mental symptoms. Typically, ADHD and associated hyperactivity is known as a childhood disorder, although ADD/ADHD in adults is known to be under-diagnosed. It is distinguished from Attention Deficit Disorder (ADD) which has a reduced focus on hyperactivity type symptoms.
  • Adolescent depression: It isnot unusual for young people to experience "the blues" or feel low occasionally. Adolescence is always an unsettling time, with the many physical, emotional, psychological and social changes that accompany this stage of life.
  • Adult ADD: Attention Deficit Disorder (ADD) is a mental disorder with symptoms such as hyperactivity, inattention, poor concentration, and other similar symptoms. The disorder is called "ADHD" in modern times; see more details about Adult ADHD.

    ADD can be undiagnosed into adulthood and the adult will have varying levels of dysfunction in their work, home and social lives. Affected adults have issues with as difficulting focusing on work tasks, boredom, distractedness, and so on. See symptoms of Adult ADHD.

  • Adult ADHD: Adult ADHD, (attention deficit hyperactivity disorder) is a common neurobehavioral developmental disorder with an onset in childhood that continues into adulthood. Children do not simply grow out of ADHD, as is often believed. Just the opposite is commonly true - the symptoms of ADHD often get worse as a child grows into adulthood. The predominant behaviors of adult ADHD are the same as in children and include:
    • Inattentiveness
    • Hyperactivity
    • Impulsivity

    These behaviors result in difficulties with:

    • Concentration
    • Remaining focused on a task or activity
    • Controlling behavior
    • Hyperactivity or over-activity

    The symptoms of adult ADHD can be treated, but there currently is no cure for the disorder. Most people with ADHD can be successfully treated and lead normal, productive lives at home, work, school and with friends and family. The cause or causes of ADHD are not yet known, although researchers believe that genes may be one factor in the development of the disease. It is most likely that the disorder is the result of a combination of elements, including environmental factors, traumatic head injuries, nutrition, and social influences.

  • Alcohol abuse: Excessive alcohol as a symptom of other conditions
  • Alcohol use: Use of alcohol (as a symptom)
  • Allergic irritability syndrome: Symptoms such as irritability and poor concentration associated with nose, ear and sinus symptoms caused by allergies such as hayfever.
  • Alzheimer disease 10: An inherited form of Alzheimer's. Type 10 is caused by a genetic defect on chromosome 10p13.
  • Alzheimer disease 12: An inherited form of Alzheimer's. Type 12 is caused by a genetic defect on chromosome 8p12-q22.
  • Alzheimer disease 13: An inherited form of Alzheimer's disease that is linked to a defect on chromosome 1q21. Alzheimer's disease is a progressive disorder involving degeneration of the brain. The disease mainly affects brain functions involving thinking, memory, personality and behaviour.
  • Alzheimer disease 14: An inherited form of Alzheimer's disease that is linked to a defect on chromosome 1q25. Alzheimer's disease is a progressive disorder involving degeneration of the brain. The disease mainly affects brain functions involving thinking, memory, personality and behaviour.
  • Alzheimer disease 15: An inherited form of Alzheimer's disease that is linked to a defect on chromosome 3q22-q24. Alzheimer's disease is a progressive disorder involving degeneration of the brain. The disease mainly affects brain functions involving thinking, memory, personality and behaviour.
  • Alzheimer disease 16: Alzheimer disease 16 (late-onset) is a form of Alzheimer's disease that is linked to a defect on chromosome Xq21.3. Alzheimer's disease is a progressive disorder involving degeneration of the brain. The disease mainly affects brain functions involving thinking, memory, personality and behaviour.
  • Alzheimer disease 2, late-onset: Alzheimer disease 2 (late-onset) is a form of Alzheimer's disease that is linked to a defect on chromosome 19q13.2. Alzheimer's disease is a progressive disorder involving degeneration of the brain. The disease mainly affects brain functions involving thinking, memory, personality and behaviour.
  • Alzheimer disease 3, (early-onset Alzheimer disease): Alzheimer disease 3 is an early-onset form of Alzheimer's disease that is linked to a defect on chromosome 14q24.3. Alzheimer's disease is a progressive disorder involving degeneration of the brain. The disease mainly affects brain functions involving thinking, memory, personality and behaviour.
  • Alzheimer disease 5: An inherited form of Alzheimer's. Type 5 has a late onset and is caused by a genetic defect on chromosome 12p11.
  • Alzheimer disease 6: A genetic form of Alzheimer's. Type 6 has a late onset and is caused by a genetic defect on chromosome 10q24.
  • Alzheimer disease 7: An inherited form of Alzheimer's. Type 7 is caused by a genetic defect on chromosome 10p13.
  • Alzheimer disease 8: An inherited form of Alzheimer's. Type 8 is caused by a genetic defect on chromosome 20p.
  • Alzheimer disease 9: A genetic form of Alzheimer's. Type 9 has a late onset and is caused by a genetic defect on chromosome 19p13.2.
  • Alzheimer disease, early-onset, with cerebral amyloid angiopathy: An early-onset form of Alzheimer's disease that is linked to a defect on chromosome 21q21. Alzheimer's disease is a progressive disorder involving degeneration of the brain. The disease mainly affects brain functions involving thinking, memory, personality and behaviour.
  • Alzheimer disease, familial, 1: An inherited form of Alzheimer's disease that is linked to a defect on chromosome 21q. Alzheimer's disease is a progressive disorder involving degeneration of the brain. The disease mainly affects brain functions involving thinking, memory, personality and behaviour.
  • Alzheimer disease, familial, 11: An inherited form of Alzheimer's disease that is linked to a defect on chromosome 9p22.1. Alzheimer's disease is a progressive disorder involving degeneration of the brain. The disease mainly affects brain functions involving thinking, memory, personality and behaviour.
  • Alzheimer disease, familial, 3, with spastic paraparesis and apraxia: This form of Alzheimer's is an early-onset form of Alzheimer's that is linked to a defect on chromosome 14q24.3. It is characterized by features which are atypical for Alzheimer's - spastic paraparesis which occurs before the dementia symptoms and apraxia. Alzheimer's disease is a progressive disorder involving degeneration of the brain. The disease mainly affects brain functions involving thinking, memory, personality and behaviour.
  • Alzheimer disease, familial, 3, with spastic paraparesis and unusual plaques: This form of Alzheimer's is an early-onset form of Alzheimer's that is linked to a defect on chromosome 14q24.3. It is characterized by features which are atypical for Alzheimer's - spastic paraparesis which occurs before the dementia symptoms and unusual plaques in the brain. Alzheimer's disease is a progressive disorder involving degeneration of the brain. The disease mainly affects brain functions involving thinking, memory, personality and behaviour.
  • Alzheimer disease, familial, 4: An inherited form of Alzheimer's disease that is linked to a defect on chromosome 1q31-q42. Alzheimer's disease is a progressive disorder involving degeneration of the brain. The disease mainly affects brain functions involving thinking, memory, personality and behaviour.
  • Alzheimer's disease: A progressive degenerative disease of the brain of unknown cause
  • Alzheimers-like concentration difficulty: maybe to due to various causative agents
  • Amotivational syndrome: An impaired desire to engage in normal social activities and situations due to external factors such as relationships, substance or events.
  • Anemia: Reduced red blood cells in the blood
  • Anemia of pregnancy: Anemia of pregnancy is anemia that occurs during pregnancy. Women's bodies have a greater demand for iron during pregnancy and if intake is not sufficient, anemia can result. Anemia in pregnant women can lead to infant problems such as premature birth, fetal death, retarded growth and other problems.
  • Anemia, Iron-Deficiency: A lack of fully functioning red blood cells due to a deficiency of iron. The iron allows the body to make hemoglobin in red blood cells which in turn allows the red blood cell to carry oxygen.
  • Anemia, Refractory, with Excess of Blasts: A bone marrow disease which results in insufficient red blood cells in the blood (anemia). The prognosis is poor with death usually occurring within a couple of years. There are two types: type 1 refers to cases where the level of blasts is less than 10% and type 2 refers to cases where the level of blasts is 10-20%. When too many immature blood cells (blasts) are produced by the bone marrow, the condition may progress to acute myeloid leukemia - occurs in about a quarter of cases in type 1 and a third of cases in type 2.
  • Anemia, Refractory, with Excess of Blasts, type 1: A bone marrow disease which results in insufficient red blood cells in the blood (anemia). The prognosis is poor with death usually occurring within a couple of years. Type 1 refers to cases where the level of blasts is less than 10% and type 2 refers to cases where the level of blasts is 10-20%. When too many immature blood cells (blasts) are produced by the bone marrow, the condition may progress to acute myeloid leukemia - occurs in about a quarter of cases in type 1.
  • Anemia, Refractory, with Excess of Blasts, type 2: A bone marrow disease which results in insufficient red blood cells in the blood (anemia). The prognosis is poor with death usually occurring within a couple of years. Type 1 refers to cases where the level of blasts is less than 10% and type 2 refers to cases where the level of blasts is 10-20%. When too many immature blood cells (blasts) are produced by the bone marrow, the condition may progress to acute myeloid leukemia - occurs in about a third of cases in type 2.
  • Anxiety: Excessive worry, anxiety, or fear.
  • Anxiety disorder: A mental condition that is characterized by anxiety and avoidance behaviours
  • Aplastic anemia: A blood disorder where the bone marrow produces insufficient new blood cells.
  • Attention Deficit-Hyperactivity Disorder, Susceptibility to, 1: ADHD or attention deficit hyperactivity disorder is a common neurobehavioral developmental disorder that usually occurs in childhood and can continue into adulthood. Researchers have discovered a number of genes linked to an increased susceptibility to ADHD. Type 1 is linked to a defect on chromosome 16p13.
  • Attention Deficit-Hyperactivity Disorder, Susceptibility to, 2: ADHD or attention deficit hyperactivity disorder is a common neurobehavioral developmental disorder that usually occurs in childhood and can continue into adulthood. Researchers have discovered a number of genes linked to an increased susceptibility to ADHD. Type 2 is linked to a defect on chromosome 17p11.
  • Attention Deficit-Hyperactivity Disorder, Susceptibility to, 3: ADHD or attention deficit hyperactivity disorder is a common neurobehavioral developmental disorder that usually occurs in childhood and can continue into adulthood. Researchers have discovered a number of genes linked to an increased susceptibility to ADHD. Type 3 is linked to a defect on chromosome 6q12.
  • Attention Deficit-Hyperactivity Disorder, Susceptibility to, 4: ADHD or attention deficit hyperactivity disorder is a common neurobehavioral developmental disorder that usually occurs in childhood and can continue into adulthood. Researchers have discovered a number of genes linked to an increased susceptibility to ADHD. Type 4 is linked to a defect on chromosome 5p13.
  • Attention Deficit-Hyperactivity Disorder, Susceptibility to, 5: ADHD or attention deficit hyperactivity disorder is a common neurobehavioral developmental disorder that usually occurs in childhood and can continue into adulthood. Researchers have discovered a number of genes linked to an increased susceptibility to ADHD. Type 5 is linked to a defect on chromosome 2q21.1.
  • Attention Deficit-Hyperactivity Disorder, Susceptibility to, 6: ADHD or attention deficit hyperactivity disorder is a common neurobehavioral developmental disorder that usually occurs in childhood and can continue into adulthood. Researchers have discovered a number of genes linked to an increased susceptibility to ADHD. Type 6 is linked to a defect on chromosome 13q12.11.
  • Attention Deficit-Hyperactivity Disorder, Susceptibility to, 7: ADHD or attention deficit hyperactivity disorder is a common neurobehavioral developmental disorder that usually occurs in childhood and can continue into adulthood. Researchers have discovered a number of genes linked to an increased susceptibility to ADHD. Type 7 is linked to a defect on chromosome 12q21.
  • Autoimmune Hemolytic Anemia: Autoimmune hemolytic anemia is characterized by an abnormal immune system response which leads to the destruction of red blood cells and hence anemia. The severity of the condition varies depending on the underlying cause e.g. cytomegalovirus, hepatitis, HIV and lupus. The condition may develop gradually or occur suddenly and cause serious symptoms.
  • Balance disorders: Problems with balance or vertigo
  • Balance symptoms: Problems with balance or vertigo
  • Barbiturate abuse: Abuse of barbiturate medications
  • Behavioral symptoms: Symptoms of personal behavior.
  • Benzodiazepine -- Teratogenic Agent: There is strong evidence to indicate that exposure to Benzodiazepine during pregnancy may have a teratogenic effect on the fetus. A teratogen is a substance that can cause birth defects. The likelihood and severity of defects may be affected by the level of exposure and the stage of pregnancy that the exposure occurred at.
  • Bipolar disorder: Cycles of mania and depression; commonly called "manic-depression".
  • Brain Concussion: Trauma resulting in minor injury to the brain which causes a period of interrupted brain function. Simple concussions resolve themselves in about a week whereas more serious ones have persisting symptoms. The onset of symptoms may be delayed.
  • Brain abscess: abscess in the brain may involve any of the lobes of the brain
  • Brain symptoms: Symptoms affecting the brain
  • Brain tumour: various extrinsic and intrinsic factors add up to to cause tumour in the brain
  • Bristowe's syndrome: Symptoms caused by a brain tumor that develops in the corpus callosum which connects the two brain hemispheres.
  • Calcification of basal ganglia with or without hypocalcemia: Calcification of a part of the brain called the basal ganglia. That calcification may be associated with conditions such as hypothyroidism, cytomegalovirus, and AIDS or may occur for no apparent reason. The severity of the condition may vary greatly from asymptomatic to neurological, psychiatric and movement disorders. The disorder may also progress at variable rates or remain stable depending on the underlying disease process.
  • Cardiomyopathy, Alcoholic: A weakened heart mucle due to excessive alcohol consumption. Symptoms are usually not evident until the heart becomes severely damaged.
  • Cataract -- aberrant oral frenula -- growth delay: A rare syndrome characterized by cataracts, growth problems and abnormal mouth tissue (frenulum).
  • Cephalosporin-induced Immune Hemolytic Anemia: Cephalosporin-induced immune hemolytic anemia is a condition where a use of a medication called Cephalosporin triggers the body's immune system to destroy it's own red blood cells which results in anemia.
  • Cerebral ventricle neoplasm: A tumor that occurs in the fluid-filled spaces of the brain called the ventricles. Symptoms vary depending on the size and exact location of the tumor and whether it is cancerous or not.
  • Chemical allergy: A chemical allergy refers to an adverse reaction by the body's immune system to a chemical. The specific symptoms that can result can vary amongst patients depending on the type and duration of the exposure and individual response.
  • Chemical poisoning -- Acrylamide: Acrylamide is a chemical used mainly in the treatment of waste water, grout agent, paper strengthening agent and adhesive agents. The type and severity of symptoms varies depending on the amount of chemical involved and the nature of the exposure.
  • Child abuse: Physical, sexual, emotional abuse or neglect of child.
  • Childhood depression: Childhood depression is just as serious as adult depression. However, it is important to recognize that children have unique signs to be aware of when recognizing and diagnosing depression.
  • Chloramphenicol-induced Sideroblastic anemia: Chloramphenicol-induced sideroblastic anemia is a blood disorder caused by taking a drug called chloramphenicol. The body has sufficient iron levels but is unable to utilise it properly in red blood cells. The iron becomes abnormally deposited in red blood cells which make them unable to function properly.
  • Chromosome 11, deletion 11p: A syndrome that is caused by the deletion of short arm (p) of chromosome 11. The type and severity of symptoms varies depending on the amount and exact location of the genetic material that is deleted.
  • Chronic Alzheimers-like concentration difficulty: maybe to due to various causative agents
  • Chronic Illness: Any form of continuing chronic illness.
  • Chronic Kidney Disease: Long-term and generally irreversible disease of the kidneys due to infection, obstruction, congenital diseases or generalised diseases causing failure of the kidneys' normal functions.
  • Chronic concentration difficulty in adults: maybe to due to various causative agents
  • Chronic concentration difficulty with headache-like symptoms: is mostly due to an organic cause
  • Chronic difficulty concentrating at work: is mostly related to stress
  • Chronic difficulty concentrating for long periods: concentrating difficulty which occurs only during particular periods
  • Chronic episodic concentration difficulty: concentrating difficulty which occurs only during particular periods
  • Chronic fatigue syndrome: A persistent debilitating fatigue of recent onset
  • Chronic feeling of having difficulty concentrating: maybe due to stress or an underlying neurological lesion
  • Chronic orthostatic hypotension: an excessive drop in blood pressure when the patient stands up causing light-headedness or dizziness
  • Chronic seasonal concentration difficulty: concentrating difficulty which occurs only during particular periods
  • Chronic tension headache: Chronic headache affecting the occiput of the head often due to overwork or stress.
  • Cocaine abuse: Stimulant drug with various effects
  • Cognitive impairment: General loss of mental or cognitive ability
  • Cold Autoimmune Hemolytic Anemia: Cold autoimmune hemolytic anemia is a condition where the body's immune system triggers the production of antibodies against the body's own red blood cells. The red cells are destroyed at an abnormally rapid rate which leads to anemia. Cold haemolytic anemia is characterized by the fact that the abnormal destruction of red blood cells is more active when the patient is exposed to cold temperatures. The severity of the condition varies depending on the underlying cause. The condition may develop gradually or occur suddenly and cause serious symptoms.
  • Combat stress reaction: A term used in the military which refers to behaviors that result from the stress of fighting in a war.
  • Concentration camp survivor syndrome: A type of post-traumatic stress disorder that is seen in people who have surveved abuse in concentration camps.
  • Concentration difficulty in adults: maybe to due to various causative agents
  • Copper deficiency-induced Sideroblastic anemia: Copper deficiency-induced sideroblastic anemia is a blood disorder caused insufficient quantities of copper. The body has sufficient iron levels but is unable to utilise it properly in red blood cells due to the lack of copper. The iron becomes abnormally deposited in red blood cells which make them unable to function properly.
  • Cycloserine-induced Sideroblastic anemia: Cycloserine -induced sideroblastic anemia is a blood disorder caused by taking a drug called Cycloserine. The body has sufficient iron levels but is unable to utilise it properly in red blood cells. The iron becomes abnormally deposited in red blood cells which make them unable to function properly.
  • Decreased cerebral perfusion: compromised blood supply to the brain
  • Decreased mean cell haemoglobin: A decreased hemoglobin content of the average red blood cell, calculated from the hemoglobin therein and the red cell count in erythrocyte indices
  • Decreased mean cell haemoglobin concentration: A decreased average haemoglobin concentration in the a specified volume
  • Decreased mean cell volume: A decreased mean red cell volume
  • Delayed sleep-phase syndrome: Delayed sleep phase syndrome is a circadian rhythm sleep disorder, a chronic disorder of the timing of sleep, peak period of alertness, core body temperature, hormonal and other daily rhythms relative to societal norms.
  • Deletion 11p: A syndrome that is caused by the deletion of short arm (p) of chromosome 11. The type and severity of symptoms varies depending on the amount and exact location of the genetic material that is deleted.
  • Depression: Inappropriate depressed mood.
  • Depressive disorders: Depression or its various related conditions.
  • Depressive symptoms: Inappropriate depressed mood.
  • Difficulty concentrating at school: it can occur either due to medical conditions or psychological conditions which affects the child's overall performance at school
  • Difficulty concentrating at work: is mostly related to stress
  • Difficulty concentrating for long periods: concentrating difficulty which occurs only during particular periods
  • Difficulty concentrating in adults: it can occur either due to medical conditions or psychological conditions
  • Difficulty concentrating in children: it can occur either due to medical conditions or psychological conditions
  • Difficulty concentrating in teens: it can occur either due to medical conditions or psychological conditions
  • Difficulty concentrating in toddlers: it can occur either due to medical conditions or psychological conditions
  • Dimorphic anemia: Dimorphic refers to anemia that has two different causes acting together e.g. iron deficiency as well as a Vitamin B12 deficiency.
  • Down's Syndrome associated Alzheimer's disease: Early-onset Alzheimer's is more prevalent in Down's Syndrome sufferers than in the general population. Alzheimer's disease is a progressive disorder involving degeneration of the brain. The disease mainly affects brain functions involving thinking, memory, personality and behaviour.
  • Doxepine-induced Immune Hemolytic Anemia: Doxepine -induced immune hemolytic anemia is a condition where use of a medication called Methyldopa triggers the body's immune system to destroy it's own red blood cells which results in anemia.
  • Drowsiness: Excessive tiredness or sleepiness
  • Drug-induced Immune Hemolytic Anemia: Drug-induced immune hemolytic anemia is a condition where a medication triggers the body's immune system to destroy its own red blood cells which results in anemia. Certain drugs are more likely to trigger this abnormal immune response than others e.g. cephalosphorins and Quinidine.
  • Drug-induced Sideroblastic anemia: Drug-induced sideroblastic anemia is a blood disorder caused by drugs such as cycloserine, isoniazid and ethanol. The body has sufficient iron levels but is unable to utilise it properly in red blood cells. The iron becomes abnormally deposited in red blood cells which make them unable to function properly.
  • Drug-related insomnia: Drug related insomnia is sleeplessness that is attributable to the excessive usage of medications.
  • Dyssomnia: A general term used to describe any sleeping condition where a person has trouble either getting to sleep or staying asleep. The condition often occurs for short periods of time but if it continues for longer periods of time it can cause problems resulting from insufficient sleep.
  • Dysthymia: Chronic depression usually associated with elderly people suffering stress from a variety of causes.
  • Dysthymia/seasonal depression disorder, PND:
  • Early-onset Alzheimer's: Early-onset Alzheimer's is a form of Alzheimer's disease that is linked to genetic defects or occurs in a familial pattern. It is not as common as the non-inherited form of Alzheimer's - occurs in up to 90% of Alzheimer sufferers. Alzheimer's disease is a progressive disorder involving degeneration of the brain. The disease mainly affects brain functions involving thinking, memory, personality and behaviour.
  • Ecstasy abuse: Use of the illicit drug called ecstasy
  • Emotional stress: A condition which occurs when a person is under stress affecting their emotions
  • Encephalitis: Infection of the brain (as a symptom)
  • Encephalopathy, familial, with neuroserpin inclusion bodies: A rare neurodegenerative disorder involving brain disease due to a genetic chemical abnormality which results in the abnormal deposit of neuroserpin inclusion bodies which is harmful to the nerves.
  • Epilepsy: Paroxysmal transient disturbances of brain function that may manifest as loss of consciousness, abnormal motor phenomena
  • Episodic concentration difficulty: concentrating difficulty which occurs only during particular periods
  • Episodic difficulty concentrating: is usually a symptom of acute stress
  • Ethanol-induced Sideroblastic anemia: Ethanol-induced sideroblastic anemia is a blood disorder caused by consuming ethanol. The body has sufficient iron levels but is unable to utilise it properly in red blood cells. The iron becomes abnormally deposited in red blood cells which make them unable to function properly.
  • Extradural hematoma: Bleeding in the skull outside the brain
  • Familial Forms of Alzheimer's Disease: Alzheimer's disease is a progressive disorder involving degeneration of the brain. The disease mainly affects brain functions involving thinking, memory, personality and behaviour. Familial forms of the disease tend to run in families and are linked to mutations on various genes. Chromosome 1, 14 19 and 21 are the main chromosomes where mutations resulting in Alzheimer's are located..
  • Familial dysautonomia: An inherited biochemical disorder that primarily affects the autonomic and sensory nervous system.
  • Fatigue: Excessive tiredness or weakness.
  • Feeling of having difficulty concentrating: maybe due to stress or an underlying neurological lesion
  • Fetal alcohol syndrome: A condition which occurs in a new born fetus and is caused by the mother consuming excess alcohol during her pregnancy
  • Fever: Raised body temperature usually with other symptoms.
  • Folate-deficiency anemia: Folate-deficiency anemia is a blood condition characterized by low levels of folate in the body which leads to a reduction in the number of red blood cells. It is usually the result of a poor diet, malabsorption issues or the use of certain medications.
  • Food Additive Adverse reaction -- MSG: An intolerance to MSG is an adverse reaction (not an immune response) by the body to a food additive called MSG which is used in a number of foods. The adverse reaction results from the body's inability to metabolize or deal with the food additive. The amount of the substance required to trigger the onset of symptoms and the nature and severity of symptoms may vary considerably between patients.
  • Food Additive Adverse reaction -- amines: An intolerance to amines is an adverse reaction (not an immune response) by the body to amines which are found naturally in foods such as bananas, pineapples, vegetables, red wine, citrus fruit and many other foods. The adverse reaction results from the body's inability to metabolize or deal with the substance. The amount of the substance required to trigger the onset of symptoms and the nature and severity of symptoms may vary considerably between patients.
  • Food Additive Adverse reaction -- chocolate: An intolerance to chocolate is an adverse reaction (not an immune response) by the body to chocolate. The adverse reaction results from the body's inability to metabolize the food. The amount of chocolate required to trigger the onset of symptoms and the nature and severity of symptoms may vary considerably between patients.
  • Food Additive Adverse reaction -- food additives: An intolerance to food additives is an adverse reaction (not an immune response) by the body to food additives. The adverse reaction results from the body's inability to metabolize or deal with the food additive. The amount of the substance required to trigger the onset of symptoms and the nature and severity of symptoms may vary considerably between patients.
  • Food Additive Adverse reaction -- salicylate: An intolerance to salicylates is an adverse reaction (not an immune response) by the body to salicylates which is an ingredient in aspirin but is also found naturally in various fruit, vegetables, herbs and spices. The adverse reaction results from the body's inability to metabolize or deal with the salicylate. The amount of the substance required to trigger the onset of symptoms and the nature and severity of symptoms may vary considerably between patients.
  • Food Additive Adverse reaction -- sulfite: An intolerance to sulfites is an adverse reaction (not an immune response) by the body to sulfites which is often used as a preservative in a variety of foods and medications including meats, salads and dried fruits. The adverse reaction results from the body's inability to metabolize or deal with the sulfite. The amount of the substance required to trigger the onset of symptoms and the nature and severity of symptoms may vary considerably between patients.
  • Food Additive Adverse reaction -- sulphite: An intolerance to sulphite is an adverse reaction (not an immune response) by the body to sulphite. The adverse reaction results from the body's inability to metabolize the substance. The amount of sulphite required to trigger the onset of symptoms and the nature and severity of symptoms may vary considerably between patients.
  • Generalised anxiety disorder: anxiety is a feeling of apprehension or fear
  • Global developmental delay -- osteopenia -- ectodermal defect: A rare syndrome characterized by developmental delay, osteopenia and skin anomalies.
  • Grand-Kaine-Fulling syndrome: A very rare syndrome characterized by disease of the retinal blood vessels and degeneration of the central nervous system.
  • Grief or loss: The normal emotional response that occurs to an external loss
  • Hangover: Condition following excessive alcohol consumption.
  • Head injury: Any injury that occurs to the head
  • Head symptoms: Symptoms affecting the head or brain
  • Headache: Pain affecting the head or brain area.
  • Hepatic failure: loss of normal liver function and metabolism of products by the liver
  • Huntington's disease: Inherited disease causing progressive mental deterioration.
  • Hydrocephalus: A condition which is characterized by marked dilatation of the cerebral ventricles
  • Hyperactivity: Excessive action and lack of control.
  • Hyperchromic Anemia: Hyperchromic anemia is a blood disorder characterized by red blood cells which contain abnormally high amounts of haemoglobin as well as a reduced number of red blood cells. This anomaly is often caused by such things as Vitamin B12 deficiency and pernicious anemia.
  • Hypopnea syndrome: Hypopnea Syndrome is a condition in which an individual experiences severe shallow breathing or a slow rate of airflow during sleep.
  • Hypoxia: This is where there is a reduction of oxygen supply to parts of the body below what is required for adequate perfusion
  • Impaired concentration: The impairment of ones ability to concentrate
  • Inability to concentrate: it can occur either due to medical conditions or psychological conditions
  • Inattention: Lack of attention or reduced attention span.
  • Infectious meningitis: Infectious meningitis is meningitis caused by bacterial, viral, or protozoan infection. Most of the agents known to cause meningitis are infectious, but very few people exposed to them will get meningitis. Those at greatest danger include people with AIDS, infants, transplant patients, and others whose immune systems may be compromised.
  • Inherited spherocytic anemia: Inherited Spherocytic anemia is an inherited blood disorder characterized by red blood cells that are shaped like a sphere (spherocytes) rather than the normal doughnut shape. These abnormal cells are broken down prematurely resulting in a shortage of red blood cells (anemia).
  • Insomnia: feeling of melancholy
  • Intermittent Alzheimers-like concentration difficulty: maybe to due to various causative agents
  • Intermittent concentration difficulty in adults: maybe to due to various causative agents
  • Intermittent concentration difficulty with headache-like symptoms: is mostly due to an organic cause
  • Intermittent difficulty concentrating for long periods: concentrating difficulty which occurs only during particular periods
  • Intermittent episodic concentration difficulty: concentrating difficulty which occurs only during particular periods
  • Intermittent feeling of having difficulty concentrating: maybe due to stress or an underlying neurological lesion
  • Intermittent seasonal concentration difficulty: concentrating difficulty which occurs only during particular periods
  • Interstitial nephritis: Any primary or secondary condition which affects the renal interstitial tissue
  • Iron deficiency anemia: Iron-deficiency anemia is a blood condition characterized by low levels of iron in the body which leads to a reduction in the number of red blood cells.
  • Isoniazid-induced Sideroblastic anemia: Drug-induced sideroblastic anemia is a blood disorder caused by taking a drug called isoniazid. The body has sufficient iron levels but is unable to utilise it properly in red blood cells. The iron becomes abnormally deposited in red blood cells which make them unable to function properly.
  • Jet lag: Jet lag is a physiological condition which is a consequence of alterations to circadian rhythms; it is classified as one of the circadian rhythm sleep disorders. Jet lag results from rapid long-distance transmeridian (east-west or west-east) travel, as on a jet plane.
  • Juvenile pilocytic astrocytoma: A type of brain tumor that occurs in children and young adults. The tumor is derived from a type of cell called an astrocyte and it can occur in various parts of the brain as well as the optic pathways and the spinal cord. Malignancy is rare. Symptoms may vary depending on the size and location of the tumor.
  • Korsakoff's psychosis: A form of amnesia involving the loss of short-term memory and inability to learn new skills. The patient may also be disorientated and delirious. The condition is often observed in chronic alcoholics.
  • Late-onset Alzheimer's: Late-onset Alzheimer's is a form of Alzheimer's disease that doesn't appear to be linked to any genetic defects or familial pattern. It is by far the most common form of Alzheimer's - occurs in up to 90% of Alzheimer sufferers. Alzheimer's disease is a progressive disorder involving degeneration of the brain. The disease mainly affects brain functions involving thinking, memory, personality and behaviour.
  • Lead encephalopathy:
  • Lead poisoning: A type of heavy metal poisoning caused by excessive exposure to lead.
  • Learning disabilities: Difficulty with learning or schooling.
  • Learning disability: A disorder that is characterized by a difficulty in learning and applying knowledge
  • Lederer's anemia: Lederer's anemia refers to the rapid destruction of red blood cells for no apparent reason.
  • Liver symptoms: Symptoms affecting the liver
  • Low concentration ability: Low concentration ability is a condition in which a person has difficulty maintaining concentration.
  • Lyme disease: Lyme disease is an emerging infectious disease caused by at least three species of bacteria belonging to the genus Borrelia.
  • Macrocytic Hyperchromic Anemia: Macrocytic Hyperchromic anemia is a blood disorder characterized by abnormally large red blood cells which contain abnormally high amounts of haemoglobin. There is also a reduced number of red blood cells. This anomaly can be associated with such things as celiac disease or alcoholism.
  • Mania: Inappropriately euphoric mood usually with hyperactivity and other symptoms.
  • Marijuana -- Teratogenic Agent: There is evidence to indicate that exposure to Marijuana during pregnancy may have a teratogenic effect on the fetus. A teratogen is a substance that can cause birth defects. The likelihood and severity of defects may be affected by the level of exposure and the stage of pregnancy that the exposure occurred at.
  • Marijuana Smoking: Smoking the leaves of a plant drug called cannabis.
  • Marijuana abuse: Illicit depressant/hallucinogenic drug
  • Marijuana addiction: Marijuana addiction is the uncontrollable desire to use marijuana on a regular basis. Frequent use leads to an increased tolerance to the drug so higher and higher doses are required to achieve the desired euphoric feeling.
  • Marijuana amotivational syndrome: Symptoms resulting from chronic marijuana use. Some experts won't recognize the symptoms as a distinctive condition.
  • Medulloblastoma: A type of brain tumor.
  • Megalocytic-Normochromic anemia: Megalocytic-Normochromic is a blood disorder characterized by normal amounts of haemoglobin within abnormally large red blood cells. However, the number of red blood cells is low.
  • Melanoma -- astrocytoma syndrome: A rare syndrome characterized by the association of a melanoma with a type of brain tumor called an astrocytoma. The exact symptoms may vary depending on the exact location of the brain tumor.
  • Membranoproliferative glomerulonephritis: A rare kidney disorder characterized by impaired kidney function due to inflammation and changes to the cells that make up the kidneys which affects it's ability to function as a filtering organ.
  • Membranoproliferative glomerulonephritis, X-linked: A kidney disorder inherited in a X-linked manner which means that only males are symptomatic but females may be carriers.
  • Meningitis: Infection of the membrane around the brain (as a symptom)
  • Mental problems: Symptoms affecting judgement, thought or intelligence.
  • Mental retardation, X-linked, Martinez type: A type of X-linked mental retardation discovered by Martinez.
  • Mental retardation, X-linked, Wittner type: A type of X-linked mental retardation discovered by Wittner.
  • Mesangiocapillary glomerulonephritis type 1: A rare kidney disorder characterized by impaired kidney function due to autoimmune processes that cause inflammation and changes to the cells that make up the kidneys.
  • Mesangiocapillary glomerulonephritis type III: A rare kidney disorder characterized by impaired kidney function due to changes to the cells that make up the kidneys which affect it's ability to filter blood.
  • Metabolic encephalopathy: disorder of the brain due to a metabolic etiology
  • Metachromatic Leukodystrophy: An inherited biochemical deficiency involving a deficiency of the enzyme called arylsulfatase A which leads to a harmful buildup of fatty material in the body.
  • Methyldopa-induced Immune Hemolytic Anemia: Methyldopa-induced immune hemolytic anemia is a condition where use of a medication called Methyldopa triggers the body's immune system to destroy it's own red blood cells which results in anemia.
  • Microcytic Anemia: Microcytic anemia is a blood disorder characterized by small red blood cells (erythrocytes). The red blood cells are small due to a failure of haemoglobin synthesis or insufficient quantities of haemoglobin available. The blood disorder is usually caused by conditions such as iron deficiency, chronic diseases and thalassemias.
  • Microcytic Hyperchromic Anemia: Microcytic Hyperchromic anemia is a blood disorder characterized by abnormally small red blood cells which contain abnormally high amounts of haemoglobin. There is also a reduced number of red blood cells. This anomaly can be associated with such things as chronic infections and severe malnutrition.
  • Microcytic hypochromic anemia: Microcytic anemia is a blood disorder characterized by small red blood cells (erythrocytes) which have insufficient haemoglobin and hence have a reduced ability to carry oxygen through the body. The red blood cells are small due to a failure of haemoglobin synthesis or insufficient quantities of haemoglobin available. The blood disorder is usually caused by conditions such as iron deficiency, chronic diseases and thalassemias. The severity and range of symptoms is variable.
  • Microcytic-Normochromic anemia: Microcytic-Normochromic anemia is a blood disorder characterized by normal amounts of haemoglobin within small red blood cells. However the number of red blood cells is low.
  • Mild Alzheimers-like concentration difficulty: maybe to due to various causative agents
  • Mild Traumatic Brain Injury: Mild brain injury caused by trauma, accident or injury
  • Mild concentration difficulty in adults: maybe to due to various causative agents
  • Mild concentration difficulty with headache-like symptoms: is mostly due to an organic cause
  • Mild difficulty concentrating at work: is mostly related to stress
  • Mild difficulty concentrating for long periods: concentrating difficulty which occurs only during particular periods
  • Mild episodic concentration difficulty: concentrating difficulty which occurs only during particular periods
  • Mild feeling of having difficulty concentrating: maybe due to stress or an underlying neurological lesion
  • Mild seasonal concentration difficulty: concentrating difficulty which occurs only during particular periods
  • Multiple Sclerosis: Autoimmune attack on spinal nerves causing diverse and varying neural problems.
  • Multiple Sclerosis, Susceptibility To, 1: Multiple sclerosis is a nerve or spinal cord disease that causes random damage to parts of the nervous system. The result is a diverse range of possible symptoms depending on which parts of the cord are damaged, and how often the inflammation reoccurs. Typical symptoms are any kind of tingling, numbness, burning sensations, "pins-and-needles" or other types of sensory changes in various parts of the body. Researchers have discovered that some forms of multiple sclerosis are linked to a genetic defect. Type 1 is linked to a defect on chromosome 6p21.3.
  • Multiple Sclerosis, Susceptibility To, 2: Multiple sclerosis is a nerve or spinal cord disease that causes random damage to parts of the nervous system. The result is a diverse range of possible symptoms depending on which parts of the cord are damaged, and how often the inflammation reoccurs. Typical symptoms are any kind of tingling, numbness, burning sensations, "pins-and-needles" or other types of sensory changes in various parts of the body. Researchers have discovered that some forms of multiple sclerosis are linked to a genetic defect. Type 2 is linked to a defect on chromosome 10p15.1.
  • Multiple Sclerosis, Susceptibility To, 3: Multiple sclerosis is a nerve or spinal cord disease that causes random damage to parts of the nervous system. The result is a diverse range of possible symptoms depending on which parts of the cord are damaged, and how often the inflammation reoccurs. Typical symptoms are any kind of tingling, numbness, burning sensations, "pins-and-needles" or other types of sensory changes in various parts of the body. Researchers have discovered that some forms of multiple sclerosis are linked to a genetic defect. Type 3 is linked to a defect on chromosome 5p13.2.
  • Multiple Sclerosis, Susceptibility To, 4: Multiple sclerosis is a nerve or spinal cord disease that causes random damage to parts of the nervous system. The result is a diverse range of possible symptoms depending on which parts of the cord are damaged, and how often the inflammation reoccurs. Typical symptoms are any kind of tingling, numbness, burning sensations, "pins-and-needles" or other types of sensory changes in various parts of the body. Researchers have discovered that some forms of multiple sclerosis are linked to a genetic defect. Type 4 is linked to a defect on chromosome 1p36.
  • NASH syndrome: A form of fatty liver where fat and fibrous tissue accumulate in the liver. Fatty liver is normally seen in alcoholic patients but in NASH syndrome, alcohol is not a factor. The condition may be generally asymptomatic or in some cases may lead to progressive scarring (cirrhosis) of the liver. The condition has a variable progression.
  • Nerve symptoms: Symptoms affecting the nerves
  • Neurological symptoms: Any symptoms that are caused by neurological conditions
  • Neurosyphilis: Syphilis affecting the nervous system.
  • Non-Food Allergy -- Amylcinnamic alcohol: An amylcinnamic alcohol allergy is an adverse reaction by the body's immune system to a chemical called amylcinnamic alcohol which is found in perfumes or fragrances. The body's immune system produces immunoglobulin E (IgE - an antibody) and histamine in response to contact with the allergen. The specific symptoms that can result can vary considerably amongst patients from a severe anaphylactic reaction to asthma, abdominal symptoms, eczema or headaches.
  • Non-Food Allergy -- Anisyl alcohol: An Anisyl alcohol allergy is an adverse reaction by the body's immune system to a chemical called Anisyl alcohol which is found in perfumes or fragrances. The body's immune system produces immunoglobulin E (IgE - an antibody) and histamine in response to contact with the allergen. The specific symptoms that can result can vary considerably amongst patients from a severe anaphylactic reaction to asthma, abdominal symptoms, eczema or headaches.
  • Non-Food Allergy -- Benzyl alcohol: A benzyl alcohol allergy is an adverse reaction by the body's immune system to a chemical called benzyl alcohol which is found in perfumes or fragrances. The body's immune system produces immunoglobulin E (IgE - an antibody) and histamine in response to contact with the allergen. The specific symptoms that can result can vary considerably amongst patients from a severe anaphylactic reaction to asthma, abdominal symptoms, eczema or headaches.
  • Non-Food Allergy -- Benzyl salicylate: A benzyl salicylate allergy is an adverse reaction by the body's immune system to a chemical called benzyl salicylate which is found in perfumes or fragrances. The body's immune system produces immunoglobulin E (IgE - an antibody) and histamine in response to contact with the allergen. The specific symptoms that can result can vary considerably amongst patients from a severe anaphylactic reaction to asthma, abdominal symptoms, eczema or headaches.
  • Non-Food Allergy -- Cinnamic alcohol: A cinnamic alcohol allergy is an adverse reaction by the body's immune system to a chemical called cinnamic alcohol which is found in perfumes or fragrances. Cinnamic alcohol has a hyacinth odor and is often used as a fragrance in perfumes, cosmetics, detergents, chewing gums, oral hygiene products and drinks such a cola and bitters. The body's immune system produces immunoglobulin E (IgE - an antibody) and histamine in response to contact with the allergen. The specific symptoms that can result can vary considerably amongst patients from a severe anaphylactic reaction to asthma, abdominal symptoms, eczema or headaches.
  • Non-Food Allergy -- Cinnamic aldehyde: A cinnamic aldehyde allergy is an adverse reaction by the body's immune system to a chemical called cinnamic aldehyde which is found in perfumes or fragrances. Cinnamic aldehyde has a hyacinth odor and is often used as a fragrance in perfumes, cosmetics, detergents, chewing gums, oral hygiene products and drinks such a cola and bitters. The body's immune system produces immunoglobulin E (IgE - an antibody) and histamine in response to contact with the allergen. The specific symptoms that can result can vary considerably amongst patients from a severe anaphylactic reaction to asthma, abdominal symptoms, eczema or headaches.
  • Non-Food Allergy -- Coumarin: A coumarin allergy is an adverse reaction by the body's immune system to a chemical called coumarin which is found in perfumes or fragrances. The body's immune system produces immunoglobulin E (IgE - an antibody) and histamine in response to contact with the allergen. The specific symptoms that can result can vary considerably amongst patients from a severe anaphylactic reaction to asthma, abdominal symptoms, eczema or headaches.
  • Non-Food Allergy -- Eugenol: A eugenol allergy is an adverse reaction by the body's immune system to a chemical called eugenol which is found in perfumes or fragrances. Eugenol has a spicy clove odor, is derived from cloves and cinnamon and is often used in perfumes, cosmetics, hair products, oral cleansing products and various creams and lotions. The body's immune system produces immunoglobulin E (IgE - an antibody) and histamine in response to contact with the allergen. The specific symptoms that can result can vary considerably amongst patients from a severe anaphylactic reaction to asthma, abdominal symptoms, eczema or headaches.
  • Non-Food Allergy -- Geraniol: A geraniol allergy is an adverse reaction by the body's immune system to a chemical called geraniol which is found in perfumes or fragrances. Geraniol has a sweet floral, rose smell and is commonly used in perfumes, cosmetics and skin care products. The body's immune system produces immunoglobulin E (IgE - an antibody) and histamine in response to contact with the allergen. The specific symptoms that can result can vary considerably amongst patients from a severe anaphylactic reaction to asthma, abdominal symptoms, eczema or headaches.
  • Non-Food Allergy -- Hydroxycitronellal: A Hydroxycitronellal allergy is an adverse reaction by the body's immune system to a chemical called Hydroxycitronellal which is found in perfumes or fragrances. Hydroxycitronellal has a sweet, floral odor and is often used in perfumes, soaps, cosmetics, aftershaves, eye creams, insecticides and antiseptics. The body's immune system produces immunoglobulin E (IgE - an antibody) and histamine in response to contact with the allergen. The specific symptoms that can result can vary considerably amongst patients from a severe anaphylactic reaction to asthma, abdominal symptoms, eczema or headaches.
  • Non-Food Allergy -- Isoeugenol: A isoeugenol allergy is an adverse reaction by the body's immune system to a chemical called isoeugenol which is found in perfumes or fragrances. Isoeugenol is derived from nutmeg and ylang ylang oil. The body's immune system produces immunoglobulin E (IgE - an antibody) and histamine in response to contact with the allergen. The specific symptoms that can result can vary considerably amongst patients from a severe anaphylactic reaction to asthma, abdominal symptoms, eczema or headaches.
  • Non-Food Allergy -- Musk ambrette: A musk ambrette allergy is an adverse reaction by the body's immune system to a chemical called musk ambrette which is found in perfumes or fragrances. The body's immune system produces immunoglobulin E (IgE - an antibody) and histamine in response to contact with the allergen. The specific symptoms that can result can vary considerably amongst patients from a severe anaphylactic reaction to asthma, abdominal symptoms, eczema or headaches.
  • Non-Food Allergy -- Oak moss absolute: A oak moss absolute allergy is an adverse reaction by the body's immune system to a chemical called oak moss absolute which is found in perfumes or fragrances. Oak moss absolute has an earthy, woody scent and is often used as a fragrance in men's products. The body's immune system produces immunoglobulin E (IgE - an antibody) and histamine in response to contact with the allergen. The specific symptoms that can result can vary considerably amongst patients from a severe anaphylactic reaction to asthma, abdominal symptoms, eczema or headaches.
  • Non-Food Allergy -- Sandalwood oil: A sandalwood oil allergy is an adverse reaction by the body's immune system to a chemical called sandalwood oil which is found in perfumes or fragrances. The body's immune system produces immunoglobulin E (IgE - an antibody) and histamine in response to contact with the allergen. The specific symptoms that can result can vary considerably amongst patients from a severe anaphylactic reaction to asthma, abdominal symptoms, eczema or headaches.
  • Non-Food Allergy -- Wood tar: A wood tar allergy is an adverse reaction by the body's immune system to a chemical called wood tar which is found in perfumes or fragrances. The body's immune system produces immunoglobulin E (IgE - an antibody) and histamine in response to contact with the allergen. The specific symptoms that can result can vary considerably amongst patients from a severe anaphylactic reaction to asthma, abdominal symptoms, eczema or headaches.
  • Non-Food Allergy -- perfume: A perfume allergy is an adverse reaction by the body's immune system to perfumes or fragrances. The body's immune system produces immunoglobulin E (IgE - an antibody) and histamine in response to contact with the allergen. The specific symptoms that can result can vary considerably amongst patients from a severe anaphylactic reaction to asthma, abdominal symptoms, eczema or headaches.
  • Non-hereditary spherocytic anemia: Non-inherited spherocytic anemia is an acquired blood disorder characterized by red blood cells that are shaped like a sphere (spherocytes) rather than the normal doughnut shape. These abnormal cells are broken down prematurely resulting in a shortage of red blood cells (anemia). The blood condition may result from such things as acute, widespread burns to the body, low blood phosphate levels, Zieve's syndrome and toxins from poisonous snakes, spiders and insects.
  • Normocytic anemia: Normocytic anemia is a blood disorder characterized by red blood cells which are of a normal size but present in insufficient quantities. It is often associated with chronic diseases, blood loss, bone marrow problems and kidney disease. It can also be the result of an inherited condition.
  • Normocytic-Normochromic anemia: Megalocytic-Normochromic is a blood disorder characterized by normal amounts of haemoglobin within normal-sized red blood cells. However, the number of red blood cells is low. Conditions such as haemolytic anemia, liver disease and aplastic anemia may be associated with this blood disorder.
  • Nutritional Sideroblastic anemia: Nutritional sideroblastic anemia is a blood disorder caused insufficient quantities of pyridoxine or copper. The body has sufficient iron levels but is unable to utilise it properly in red blood cells due to the lack of pyridoxine or copper. The iron becomes abnormally deposited in red blood cells which make them unable to function properly.
  • Nutritional anemia: Nutritional anemia refers to a reduced red blood cell count due to a poor diet which is deficient in iron, folat and/or Vitamin B12.
  • Obstructive sleep apnea: Obstructive sleep apnea (OSA) syndrome is characterized by episodic upper airway obstruction that occurs during sleep.
  • Osler-Vaquez disease: An uncommon chronic blood disease involving an increased red blood cell count.
  • Pain: Any type of pain sensation symptoms.
  • Panic disorder: is a severe medical condition characterized by extremely elevated mood
  • Parathyroid cancer, adult: A rare cancer that can occur in the parathyroid gland in adults. The parathyroid glands regulate body calcium levels so cancer of the gland upsets the body's calcium balance causing muscle, bone and other symptoms.
  • Penicillin-induced Immune Hemolytic Anemia: Penicillin-induced immune hemolytic anemia is a condition where use of a medication called Penicillin triggers the body's immune system to destroy it's own red blood cells which results in anemia.
  • Pernicious anemia: A megaloblastic anaemia due to malabsorption of the vitamin B12
  • Persistent anxiety: Anxiety is a feeling of apprehension or fear.
  • Personality symptoms: Symptoms or changes to the personality.
  • Pfiesteria piscicida infection: Pfiesteria piscicida is a tiny marine organism called a dinoflagellate that is found in waters where fresh and salt water mix e.g. at river mouths. It is believed to be responsible for killing fish as well as health problems in humans.
  • Pick's Disease: Degenerative dementia condition.
  • Pituitary cancer, childhood: Cancer (malignant) of the pituitary gland in children. The pituitary gland produces various hormones and some pituitary tumors (functioning tumors) can affect the secretion of one or more of these hormones resulting in a range of symptoms depending on the exact location of the tumor. Some pituitary tumors do not affect hormone production (nonfunctioning tumors).
  • Poikilocytic anemia: Poikilocytic anemia refers a blood disorder characterized by abnormally shaped red blood cells. The abnormal red blood cells may be destroyed prematurely resulting in anemia. The severity of the anemia and hence the severity of symptoms is variable.
  • Polycythemia rubra: An uncommon chronic blood disease involving an increased production of red blood cells by the bone marrow. The production of platelets and white blood cells may also be increased.
  • Polycythemia vera: Polycythemia vera refers to a condition in which there is an abnormal rise n the number of blood cells, especially red blood cells.
  • Poor concentration in adults: it can occur either due to medical conditions or psychological conditions
  • Poor concentration in children: it can occur either due to medical or psychological conditions
  • Poor concentration in teens: it can occur either due to medical conditions or psychological conditions
  • Poor concentration in toddlers: it can occur either due to medical conditions or psychological conditions
  • Postconcussive syndrome: Symptoms that can occur following a head injury.
  • Posthemorrhagic anemia: Posthemorrhagic anemia refers to a reduced number of red blood cells in the body due to bleeding.
  • Postpartum hyperthyroidism: Postpartum thyroiditis is a postpartum condition that results in temporary hyperthyroidism (overactive thyroid) or hypothyroidism.
  • Postpartum thyroiditis: The occurrence of thyroiditis in a woman that occurs after the birth of a child
  • Posttraumatic hypersomnia: Posttraumatic hypersomnia is excessive sleepiness that occurs as a result of a traumatic event involving the central nervous system.
  • Premenstrual dysphoric disorder: Premenstrual dysphoric disorder is a diagnosis used to indicate serious premenstrual distress with associated deterioration in functioning.
  • Premenstrual syndrome: A collection of symptoms that some women suffer that occurs directly before menstruation
  • Primary Autoimmune Hemolytic Anemia: Primary autoimmune hemolytic anemia is characterized by an abnormal immune system response. The body's immune system produces antibodies against the body's own red blood cells which leads to the destruction of red blood cells and hence anemia. The secondary form of the condition is the result of an underlying condition such as lupus or hepatitis whereas the primary form has no underlying condition.
  • Primary Cold Autoimmune Hemolytic Anemia: Primary cold autoimmune hemolytic anemia is a condition where the body's immune system triggers the production of antibodies against the body's own red blood cells. The process occurs only when the patient is exposed to temperatures colder the average body temperature. The red cells are destroyed at an abnormally rapid rate which leads to anemia. The primary form of the condition means that there is no underlying condition. The condition may develop gradually or occur suddenly and cause serious symptoms.
  • Primary insomnia: Primary insomnia is sleeplessness that is not attributable to a medical, psychiatric, or environmental cause.
  • Proximal myotonic dystrophy: A very rare genetic muscle disorder which is often associated with cataracts, abnormal heart rhythm and infertility. Muscle weakness tends to occur more in muscles closer to the trunk such as the neck, shoulders, hips and upper legs. Pregnancy can exacerbate or initiate symptoms.
  • Psychoneurosis: Neuroses is characterized by anxiety, depression, or other feelings of unhappiness or distress that are out of proportion to the circumstances of a person's life.
  • Pyridoxine deficiency-induced Sideroblastic anemia: Pyridoxine deficiency-induced sideroblastic anemia is a blood disorder caused insufficient quantities of pyridoxine. The body has sufficient iron levels but is unable to utilise it properly in red blood cells due to the lack of pyridoxine. The iron becomes abnormally deposited in red blood cells which make them unable to function properly.
  • Quinidine-induced Immune Hemolytic Anemia: Quinidine-induced immune hemolytic anemia is a condition where use of a medication called Methyldopa triggers the body's immune system to destroy it's own red blood cells which results in anemia.
  • Recurring Alzheimers-like concentration difficulty: maybe to due to various causative agents
  • Recurring concentration difficulty in adults: maybe to due to various causative agents
  • Recurring concentration difficulty with headache-like symptoms: is mostly due to an organic cause
  • Recurring difficulty concentrating: it can occur either due to medical conditions or psychological conditions
  • Recurring difficulty concentrating at work: is mostly related to stress
  • Recurring difficulty concentrating for long periods: concentrating difficulty which occurs only during particular periods
  • Recurring episodic concentration difficulty: concentrating difficulty which occurs only during particular periods
  • Recurring feeling of having difficulty concentrating: maybe due to stress or an underlying neurological lesion
  • Recurring seasonal concentration difficulty: concentrating difficulty which occurs only during particular periods
  • Reduced concentration in children: Reduced concentration in children refers to a less than normal ability of a child to concentrate.
  • Renal failure: A condition characterized by a failure of the kidney to excrete toxic metabolites from the body
  • Restless leg syndrome: irrestible urge to move one's body to stop uncomfortable or odd sensation
  • Restlessness: state of overactive restlessness
  • Right parietal lobe syndrome related Alzheimer's disease: Right parietal lobe syndrome related Alzheimer's disease is a variant of Alzheimer's disease that involves abnormalities in a particular part of the brain. It is characterized by Alzheimer's symptoms as well as problems with such things as construction (making things) and drawing as well as denial of their disabilities. Alzheimer's disease is a progressive disorder involving degeneration of the brain. The disease mainly affects brain functions involving thinking, memory, personality and behaviour.
  • Schizophrenia: A psychiatric disorder characterized by hallucinations and delusional beliefs where a person is unable to distinguish between reality and imagination. The condition tends to have a chronic nature and can be severely debilitating if treatment isn't sought.
  • Seasonal concentration difficulty: concentrating difficulty which occurs only during particular periods
  • Secondary Autoimmune Hemolytic Anemia: Secondary autoimmune hemolytic anemia is characterized by an abnormal immune system response. The body's immune system produces antibodies against the body's own red blood cells which leads to the destruction of red blood cells and hence anemia. The secondary form of the condition is the result of an underlying condition such as lupus or hepatitis whereas the primary form has no underlying condition. The condition may develop gradually or occur suddenly and cause serious symptoms.
  • Secondary Cold Autoimmune Hemolytic Anemia: Secondary cold autoimmune hemolytic anemia is a condition where the body's immune system triggers the production of antibodies against the body's own red blood cells. The process occurs only when the patient is exposed to temperatures colder the average body temperature. The red cells are destroyed at an abnormally rapid rate which leads to anemia. The secondary form of the condition means that it is the result of an underlying condition - it usually occurs after some sort of infection. The condition may develop gradually or occur suddenly and cause serious symptoms.
  • Severe Alzheimers-like concentration difficulty: maybe to due to various causative agents
  • Severe concentration difficulty in adults: maybe to due to various causative agents
  • Severe concentration difficulty with headache-like symptoms: is mostly due to an organic cause
  • Severe difficulty concentrating: it can occur either due to medical conditions or psychological conditions
  • Severe difficulty concentrating at work: is mostly related to stress
  • Severe difficulty concentrating for long periods: concentrating difficulty which occurs only during particular periods
  • Severe episodic concentration difficulty: concentrating difficulty which occurs only during particular periods
  • Severe feeling of having difficulty concentrating: maybe due to stress or an underlying neurological lesion
  • Severe seasonal concentration difficulty: concentrating difficulty which occurs only during particular periods
  • Shift work sleep disorder: Shift work sleep disorder is a circadian rhythm sleep disorder which affects people who change their work or sleep schedules frequently or work longterm on other than the day shift.
  • Sickle Cell Anemia: Sickle cell anemia is an inherited blood disorder characterized by red blood cells which are crescent-shaped rather than the normal doughnut shape. These abnormally shaped red blood cells are unable to function normally and tend to undergo premature destruction which leads to anemia. If the genetic defect which causes the condition is inherited from both parents the condition can be quite severe whereas if it is inherited from only one parent, often there are no symptoms. The abnormally shaped red blood cells can cause problems when they clump together and block blood vessels.
  • Sideroblastic anemia: Sideroblastic anemia is a blood disorder where the body has sufficient iron levels but is unable to utilise it properly in red blood cells. The iron becomes abnormally deposited in red blood cells which make them unable to function properly. The condition may be inherited, acquired or secondary.
  • Sideroblastic anemia, hereditary: An inherited form of anemia where an enzyme deficiency prevents red blood cells from using iron properly. The red blood cells become overloaded with iron which impairs the blood's ability to carry oxygen.
  • Sideroblastic anemia, pyridoxine-responsive, autosomal recessive: Pyridoxine-responsive sideroblastic anemia is a rare inherited blood disorder characterized by abnormal deposits of iron in the red blood cells which makes them unable to function properly. The condition is inherited in an autosomal recessive manner and responds to treatment with pyridoxine.
  • Sideropenic anemia: Sideropenic anemia is a blood abnormality characterized by reduced iron levels in the plasma. It is a very common form of anemia.
  • Sleep Apnea Syndromes: Syndromes involving the cessation of breathing during sleep. Examples include obstructive sleep apnea and central sleep apnea. The condition may range from mild to severe.
  • Sleep apnea: A condition which is characterized by transient attacks of apnea that usually occur during ones sleep
  • Smoking Cessation:
  • Spherocytic anemia: Spherocytic anemia is a blood disorder characterized by red blood cells that are shaped like a sphere (spherocytes) rather than the normal doughnut shape. These abnormal cells are broken down prematurely resulting in a shortage of red blood cells (anemia). The condition may be inherited or acquired.
  • Spur-cell anemia: Spur-cell anemia is a form of anemia where the red blood cells have an unusual spiked appearance. These abnormally shaped cells are destroyed earlier than normal and if new red blood cells aren't made fast enough to replace them, anemia can result. The condition may be acquired (e.g. in severe liver disease, especially when related to alcoholism) or inherited (e.g. abetalipoproteinemia).
  • Stress: Emotional stress (sometimes refers to physical stress)
  • Stroke symptoms: Brain-related symptoms of bleeding or blockage.
  • Subarachnoid hemorrhage: subarachnoid hemorrhage is bleeding in the area between the brain and the thin tissues that cover the brain. This area is called the subarachnoid space
  • Subdural hematoma: A condition which is characterized by a blood clot beneath the dura mater
  • Sulphonamide -induced Immune Hemolytic Anemia: Sulphonamide-induced immune hemolytic anemia is a condition where use of a medication called Methyldopa triggers the body's immune system to destroy it's own red blood cells which results in anemia.
  • Tinnitus: A continual ringing sensation occurring in one or both ears
  • Tiredness: Feeling tired either physically or mentally
  • Toxin-induced Sideroblastic anemia: Toxin-induced sideroblastic anemia is a blood disorder caused by toxins such as lead or zinc poisoning. The body has sufficient iron levels but is unable to utilise it properly in red blood cells. The iron becomes abnormally deposited in red blood cells which make them unable to function properly.
  • UDP-Galactose-4-epimerase deficiency: A condition which is characterised by a mutation in the UDP-galactose-4-epimerase gene.
  • Ulna hypoplasia with mental retardation: A condition which is characterised by short upper limbs, club feet, and absence of fingernails.
  • Ulnar hypoplasia with mental retardation: A condition which is characterised by short upper limbs, club feet, and absence of fingernails
  • Uniparental disomy: Getting both of a chromosome pair from one parent
  • Uniparental disomy 13: A condition which is characterised by the uniparental disomy of chromosome 13
  • Uniparental disomy of 11: A condition which is characterised by the uniparental disomy of chromosome 11
  • Uniparental disomy of 13: A condition which is characterized by the uniparental disomy of chromosome 13. This means that the patient receives two copies of chromosome 13 from one parent instead of one copy from each parent. The type and severity of symptoms varies depending on the amount and exact location of the genetic material that is duplicated.
  • Uniparental disomy of 2: A condition which is characterised by the uniparental disomy of chromosome 2
  • Uniparental disomy of 6: A condition which is characterised by the uniparental disomy of chromosome 6
  • Uniparental disomy, paternal, chromosome 14: A condition which is characterised by the uniparental disomy of chromosome 14
  • Urban Roger Meyer syndrome: A syndrome which is characterised by genital anomalies, mental retardation, and obesity
  • Uremic encephalopathy: occurs due to build up of toxins which are normally cleared by the kidneys
  • Urocanase deficiency: A condition characterised by the deficiency of the urocanase enzyme
  • Usher Syndrome Type 3: A rare inherited disorder where children are born with normal hearing and vision which progressively deteriorates at a variable rate.
  • Vagneur Triolle Ripert syndrome: A condition that is characterised by lymphoedema of the lower extremities and recurrent respiratory system problems
  • Van Bogaert-Hozay syndrome: A rare disorder characterized by destruction of ends of finger bones, mental retardation, skin wasting and eye and facial abnormalities.
  • Van den Bosch syndrome: A syndrome which is characterised by mental deficiency, choroideremia, acrokeratosis, verruciformis, anhidrosis, skeletal deformity
  • Vaquez disease: An uncommon chronic blood disease involving an increased red blood cell count.
  • Vasquez Hurst Sotos syndrome: A rare genetic disorder characterized by underdeveloped genitals, obesity, mental retardation and skeletal abnormalities.
  • Venencie Powell Winkelmann syndrome: A congenital condition that is characterised by the occurrence of a number of clinical signs and symptoms
  • Verloes Gillerot Fryns syndrome: A syndrome characterised by multiple congenital abnormalities and mental retardation.
  • Viljoen Smart syndrome: A type of x-linked mental retardation discovered by Hamel
  • Viljoen Winship syndrome: A type of x-linked mental retardation discovered by Gustavson
  • Viljone Kallis Voges syndrome: A syndrome characterised by microcephaly, short stature, brachydactyly, low set ears, prominent nose and mental retardation
  • Vitamin B12 Deficiency: A deficiency of Vitamin B12 primarily causes anemias the body is unable to make sufficient quantities of normal red blood cells. Severe cases can lead to permanent nervous system problems. The vitamin B12 deficiency can result from absorption problems, insufficient dietary intake, certain medications (e.g. metformin), inherited conditions (e.g. transcobalamin deficiency) and certain chronic parasitic intestinal infestations.
  • Vitiligo mental retardation facial dysmorphism uremia: A condition that is characterised by a number of symptoms including mental retardation, facial dysmorphism and uremia
  • W syndrome: A rare genetic disorder involving distinctive facial features, mental retardation, speech problems and limb deformities.
  • WAGR Syndrome: A syndrome that is due to the deletion of chromosome 11.
  • Walker Dyson syndrome: A syndrome that is characterised by mental retardation, aniridia and vision problems.
  • War sailor syndrome: A type of post-traumatic stress disorder that occurred in merchant ship sailors from World War II.
  • Warburg Sjo Fledelius syndrome: A syndrome that is characterised by visual and neurological problems as well as microgenitalia
  • Warburton Anyane Yeboa syndrome: A syndrome that is characterised by the occurrence of aneuploidy that can be manifested as monosomies or trisomies
  • Warfarin syndrome: Various physical and other abnormalities that can result from the use of the drug Warfarin during the first trimester of pregnancy.
  • Warm Autoimmune Hemolytic Anemia: Warm autoimmune hemolytic anemia is a condition where the body's immune system triggers the production of antibodies against the body's own red blood cells. The red cells are destroyed at an abnormally rapid rate which leads to anemia. Warm haemolytic anemia is characterized by the fact that the abnormal destruction of red blood cells is more active when the patient is exposed to warm temperatures. The severity of the condition varies depending on the underlying cause e.g. cytomegalovirus, hepatitis, HIV and lupus. The condition may develop gradually or occur suddenly and cause serious symptoms.
  • Watson syndrome: A rare syndrome characterized by short stature, reduced intelligence, café au lait spots and narrowing of pulmonary valves.
  • Webster Deming syndrome: A craniofrontonasal dysplasia that is x-linked in inheritance
  • Weismann-Netter-Stuhl Syndrome: A very rare inherited disorder characterized by bone development abnormalities.
  • Weleber Hecht Bigley syndrome: A syndrome that is characterised by cataract hyperostosis and dislocating patella
  • Wellesley Carmen French syndrome: A syndrome characterised visual difficulties and growth retardation
  • Wellesley-Carman-French Syndrome: A rare syndrome characterized by cataracts, growth problems and abnormal mouth tissue (frenulum).
  • Wernicke's encephalopathy: Brain condition with various effects
  • Westphal disease: A condition that is closely associated with Huntington's disease and is a clinical variant of it
  • Whiplash: Neck injury often from a car accident.
  • Whiplash Injuries: An injury to the neck when the neck is rapidly forced backward and then forwards or vice versa. It most commonly occurs in vehicle accidents when the vehicle is stopped abruptly or pushed forwards suddenly.
  • White matter hypoplasia, corpus callosum agenesia, and mental retardation: A syndrome which is characterised by white matter hypoplasia, corpus callosum agenesia, and mental retardation
  • Wieacker syndrome: A rare disorder involving muscle weakness and wasting, foot deformities, mental retardation and face muscle anomalies.
  • Wieacker-Wolff Syndrome:
  • Wiedemann Oldigs Oppermann syndrome: A rare syndrome characterized mainly by excessive hair growth, mental retardation and skeletal abnormalities.
  • Wilkes Stevenson syndrome: A syndrome that is characterised by multiple congenital abnormalities
  • Williams Syndrome: A syndrome characterised by mental retardation, facial abnormalities and emotional instability
  • Wilms tumor -- aniridia -- genitourinary anomalies -- mental retardation: A syndrome resulting from deletion of genetic material from chromosome the short arm of chromosome 11 (11p13). The characteristic symptoms are partial or complete absence of iris, genitourinary anomalies, mental retardation and Wilms' tumor. The specific range and severity of symptoms is variable depending on the size and exact location of the genetic material that is missing.
  • Wilson-Turner X-linked mental retardation: A condition that is characterised by mental retardation with gynecomastia and obesity
  • Winship Viljoen Leary syndrome: A syndrome that is characterised by microcephaly with mental retardation and cardiomyopathy
  • Wolcott-Rallison syndrome: A very rare genetic condition characterized primarily by the onset of diabetes mellitus during infancy and epiphyseal dysplasia (abnormal joint development).
  • Wolf-Hirschorn syndrome: A syndrome characterised by the partial deletion of the short arm of chromosome 4
  • Worster Drought syndrome: A mild form of tetraplegic cerebral palsy
  • X chromosome, duplication Xq13 1 q21 1: A condition characterised by the duplication of the long arm of chromosome X.
  • X chromosome, trisomy 26-28: A condition characterised by the duplication of the long arm of chromosome X.
  • X chromosome, trisomy Xp3: A condition characterised by the duplication of the long arm of chromosome X.
  • X chromosome, trisomy Xpter Xq13: A condition characterised by the duplication of the long arm of chromosome X.
  • X chromosome, trisomy Xq: A condition characterised by the duplication of the long arm of chromosome X.
  • X chromosome, trisomy Xq25: A condition characterised by the duplication of the long arm of chromosome X.
  • X fragile site folic acid type: A fragile X syndrome that is characterised by mental retardation and developmental delay
  • X-linked alpha thalassemia mental retardation syndrome (ATR-X): An x-linked condition that features mental retardation, dysmorphic features, and alpha thalassemia
  • X-linked mental retardation Brooks type: A type of x-linked mental retardation discovered by Brooks
  • X-linked mental retardation Hamel type: A type of x-linked mental retardation discovered by Hamel
  • X-linked mental retardation associated with marXq2: A type of x-linked mental retardation associated with the marXq2 gene
  • X-linked mental retardation craniofacial abnormal microcepahly club: An x-linked condition that is characterised by mental retardation and dysmorphic facies
  • X-linked mental retardation de silva type: A type of x-linked mental retardation discovered by De Silva
  • X-linked mental retardation type Gustavson: A type of x-linked mental retardation discovered by Gustavson
  • X-linked mental retardation type Martinez: A type of x-linked mental retardation discovered by Martinez
  • X-linked mental retardation type Raynaud: A type of x-linked mental retardation discovered by Raynaud
  • X-linked mental retardation type Schutz: A type of x-linked mental retardation discovered by Schutz
  • X-linked mental retardation type Wittner: A type of x-linked mental retardation discovered by Wittner
  • X-linked sideroblastic anaemia:
  • X-linked sideroblastic anemia: X-linked sideroblastic anemia is a rare inherited blood disorder characterized by abnormal deposits of iron in the red blood cells which makes them unable to function properly. The body continues to absorb more iron from digesting food in order to try and correct the problem but this simply leads to excessive iron being deposited in body tissues as the it can't use the iron properly. The severity of the condition is variable.
  • Young Hughes syndrome: A sex linked condition that is characterised by mental retardation and hypogonadism
  • Young McKeever Squier syndrome: A condition that affects the olivopontocerebellum and the cerebellar cortex of the brain
  • Zazam Sheriff Phillips syndrome: A medical condition that is characterised by deformities of the eyes and face
  • Zerres Rietschel Majewski syndrome: A condition that affects an individual resulting in several physical deformities and mental conditions
  • Zlotogora syndrome: A condition that is characterised by facial dysmorphism and psychiatric problems

Conditions listing medical symptoms: Concentration difficulty:

The following list of conditions have 'Concentration difficulty' or similar listed as a symptom in our database. This computer-generated list may be inaccurate or incomplete. Always seek prompt professional medical advice about the cause of any symptom.

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Conditions listing medical complications: Concentration difficulty:

The following list of medical conditions have 'Concentration difficulty' or similar listed as a medical complication in our database.

 

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