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Dilated pupils

Dilated pupils: Introduction

Dilated pupils occur when the pupils of the eyes increase in size. The pupils are commonly known as the round, black centers of the eyes. Dilation of the pupils is a normal response to low levels of light or darkness. This response helps a person to see better in situations of low light.

Excessively dilated pupils (mydriasis) or unequal pupils can be a sign or symptom of a wide variety of mild to serious diseases, disorders and conditions. Dilate pupils can be due to head trauma, malignancy, neurological conditions, poisonings, death, and the use of certain recreational drugs and therapeutic medications.

Dilated pupils or unequal pupils can be the result of such serious, potentially life-threatening neurological conditions, intracranial hematoma, ruptured brain aneurysm, hemorrhagic stroke, intracranial hemorrhage, high intracranial pressure or a brain tumor.

Dilated pupils that are fixed and do not respond to light are one sign of death.

Dilated pupils can also be a sign of a wide variety of plant poisonings or chemical poisonings. Dilated pupils can be due to black nightshade poisoning and toxic mushroom poisoning.

Dilated pupils also occur with the use of certain types of therapeutic medications, such as antihistamines and atropine eye drops or pills. Dilated pupils can also be a sign of illegal or recreational drug use, such as methamphetamine use, marijuana use, amphetamine use, LSD use. Dilated pupils can also be a sign of narcotic withdrawal and heroin withdrawal.

Depending on the underlying disease, disorder or condition that causes dilated pupils, it often occurs in conjunction with other symptoms, such as altered level of consciousness and coma. Complications of underlying disease, disorders and conditions that cause dilated or unequal pupils vary and can be serious and life-threatening. For more details about symptoms and complications, see symptoms of dilated pupils.

Diagnosing dilated pupils and its root cause begins with taking a thorough personal and family medical history, including symptoms, and completing a physical examination, including an eye exam and thorough neurological examination. An eye examination includes testing how the pupils respond to light and comparing the size and reactivity of the two pupils.

A neurological exam includes assessing a patient's level of consciousness, orientation, speech, verbal response to simple questions and ability to open eyes and follow simple commands. Simple bedside testing and assessment of the functioning of the eight cranial nerves is also performed.

Lab testing varies depending on the suspected underlying cause of dilated or unequal pupils. Blood tests may include arterial blood gases, complete blood count (CBC), glucose, electrolytes, blood urea nitrogen and creatinine, and drug screen and ethanol (alcohol) levels.

CT and MRI of the brain is done in suspected cases of head trauma, intracranial hematoma, ruptured brain aneurysm, hemorrhagic stroke, intracranial hemorrhage, high intracranial pressure, or a brain tumor. X-rays of the cerebral blood vessels, called cerebral angiography, may also be done if a developing brain aneurysm is suspected.

A diagnosis of a serious underlying cause of dilated pupils may be delayed because dilated pupils can be a late sign of a developing condition. For information on misdiagnosis, refer to misdiagnosis of dilated pupils.

Treatment of dilated pupils involves diagnosing and treating the underlying disease, disorder or condition that is causing it. Some conditions that cause dilated or unequal pupils, such as ruptured cerebral aneurysm may not have an optimal prognosis. For more information on treatment, refer to treatment of dilated pupils....more »

Dilated pupils: Misdiagnosis

Diagnosing the underlying cause of dilated pupils may be delayed because a dilated pupil can be a late sign of a critical condition, such as serious head trauma. Earlier symptoms include headache, confusion and vomiting. Dilated pupils and unequal pupils are a sign or symptom of many different conditions, so a thorough medical evaluation is needed to ensure an accurate diagnosis of ...more misdiagnosis »

Home Diagnostic Testing and Dilated pupils

Home medical tests possibly related to Dilated pupils:

Dilated pupils: Symptom Checker

Listed below are some combinations of symptoms associated with Dilated pupils, as listed in our database. Visit the Symptom Checker, to add and remove symptoms and research your condition.

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Dilated pupils Treatments

Treatment plans for dilated pupils are individualized depending on the underlying cause, the presence of coexisting diseases, the age and medical history of the patient, and other factors. Treatment generally involves a multifaceted plan that addresses the underlying cause, and minimizes the develoment of serious complications.

Hospitalization and intensive care are generally ...Dilated pupils Treatments

Review further information on Dilated pupils Treatments.

Stories from Users for Dilated pupils

Real-life user stories relating to Dilated pupils:

Dilated pupils: Animations

Medications or substances causing Dilated pupils:

The following drugs, medications, substances or toxins are some of the possible causes of Dilated pupils as a symptom. Always advise your doctor of any medications or treatments you are using, including prescription, over-the-counter, supplements, herbal or alternative treatments.

Drug interactions causing Dilated pupils:

When combined, certain drugs, medications, substances or toxins may react causing Dilated pupils as a symptom. Always advise your doctor of any medications or treatments you are using, including prescription, over-the-counter, supplements, herbal or alternative treatments.

  • Phenelzine and tricyclic antidepressant interaction
  • Nardil and tricyclic antidepressant interaction
  • Parnate and tricyclic antidepressant interaction
  • Tagamet (Cimetidine) and Adapin (Doxepin) interaction
  • Tagamet (Cimetidine) and Sinequan (Doxepin) interaction
  • Tagamet (Cimetidine) and Aventyl (Nortriptyline) interaction
  • Tagamet (Cimetidine) and Anafranil (Clomipramine) interaction
  • Tagamet (Cimetidine) and Asendin (Amoxapine) interaction
  • more interactions...»

Dilated pupils: Comorbid Symptoms

Some of the comorbid or associated medical symptoms for Dilated pupils may include these symptoms:

Causes of General Symptom Types

Research the causes of these more general types of symptom:

Causes of Similar Symptoms to Dilated pupils

Research the causes of these symptoms that are similar to, or related to, the symptom Dilated pupils:

Dilated pupils: Deaths

Read more about causes and Dilated pupils deaths.

Dilated pupils: Research Related Doctors & Specialists

Other ways to find a doctor, or use doctor, physician and specialist online research services:

Dilated pupils: Undiagnosed Conditions

Conditions that are commonly undiagnosed in related areas may include:

Causes of Dilated pupils listed in Disease Database:

Other medical conditions listed in the Disease Database as possible causes of Dilated pupils as a symptom include:

Definitions of Dilated pupils:

Dilation of pupils to greater than 6 mm combined with failure of the pupils to constrict when stimulated with light. This condition may occur due to injury of the pupillary fibers in the oculomotor nerve, in acute angle-closure glaucoma, and in ADIE SYNDROME.
- (Source - Diseases Database)

Detailed list of causes of Dilated pupils

The list below shows some of the causes of Dilated pupils mentioned in various sources:

How Common are these Causes of Dilated pupils?

This information refers to the general prevalence and incidence of these diseases, not to how likely they are to be the actual cause of Dilated pupils. Of the 161 causes of Dilated pupils that we have listed, we have the following prevalence/incidence information:

  • 0 causes are "very common" diseases
  • 1 causes are "common" diseases
  • 0 causes are "uncommon" diseases
  • 0 causes are "rare" diseases
  • 3 causes are "very rare" diseases
  • 160 causes have no prevalence information.

Conditions listing medical symptoms: Dilated pupils:

The following list of conditions have 'Dilated pupils' 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.

Select from the following alphabetical view of conditions which include a symptom of Dilated pupils or choose View All.

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Causes of Dilated pupils Based on Risk Factors

This information shows analysis of the list of causes of Dilated pupils based on whether certain risk factors apply to the patient:

  • Diabetes - history of diabetes or family history of diabetes?

    What are the alternative names for Dilated pupils:

    Pupillary dilation, Mydriasis
    - (Source - Diseases Database)

    Classifications of Dilated pupils:

    Medical Conditions associated with Dilated pupils:

    Pupil symptoms (182 causes), Eye symptoms (5412 causes), Face symptoms (8109 causes), Head symptoms (10192 causes)

    Symptoms related to Dilated pupils:

    Pupil symptoms (182 causes), Pupil constriction (8 causes), Eye symptoms (5412 causes), 3rd cranial nerve disorder, Antipsychotic agents, Atropine, Autonomic seizure (1 cause), Brain death, Cerebral oedema (17 causes), Chlorpheniramine, Chlorpromazine, Cinnarizine, Cocaine

    Medical articles on signs and symptoms:

    Doctor-patient articles related to symptoms and diagnosis:

    These general medical articles may be of interest:

    Medical News summaries about Dilated pupils

    Our news pages contain the following medical news summaries about Dilated pupils and many other medical conditions:

    Evidence Based Medicine Research for Dilated pupils

    Medical research papers related to Dilated pupils include:

    Research More Evidence-Based Medicine at TripDatabase.com

    Related medical articles from our Disease Center for Dilated Pupils:

    More Ways To Research Medical Signs and Symptoms:

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