Ancylostoma duodenale: An infestation with Ancylostoma duodenale which is a parasitic hookwork whichcan cause serious disease in humans - usually occurs in people who work barefoot in damp soil. The hookworms suck blood from the intestines of the host which can result in anemia if there is a large number of worms.
Angiodysplasia: Abnormality of small blood vessels - especially in the intestinal tract - which can result in bleeding. The size of the lesion involved determines the severity of the condition. Small amounts of bleeding from one lesion often goes unnoticed but multiple large lesions may cause heavy bleeding and result in black tarry stool and anemia.
Angiostrongyliasis: Infection by a parasitic worm (Angiostrongylus). Infection can occur through eating contaminated raw animals such as snails, slugs, prawns or crabs which act as hosts to these parasites.
Anthrax: A serious infectious bacterial disease that can be fatal.
Balantidiasis: Intestinal infection with a parasitic protozoa (Balantidium coli) resulting in intestinal inflammation. It is usually transmitted through direct or indirect contact with pig fecal matter.
Banti's syndrome: A rare condition where chronic congestive spleen enlargement causes it to destroy red blood cells too early. The spleen becomes enlarged due to an obstruction of blood flow in the organ and the resulting increase in blood pressure.
Essential thrombocytosis - same as essential thrombocythemia: A rare blood disorder where the blood contains too many platelets due to excessive megakaryocytes (platelet-producing cells). Platelets are essential for blood clotting but in essential thrombocythemia excessive platelets can cause the blood to form abnormal clots. If the platelets are defective as well then bleeding problems can occur. The severity of the condition is variable.
Hematochezia: is the passage of bright red, bloody stools from the rectum
Hemorrhagic thrombocythemia: A rare blood disorder characterized by increased number of platelets in the blood which often results in an enlarged spleen, bleeding and blood vessel blockages.
Hepatorenal tyrosinemia: A rare genetic metabolic disorder characterized by a deficiency of particular enzymes which prevents the breakdown of tyrosine which then builds up in the liver. Type 1 involves a deficiency of the enzyme fumaril acetoacetate hydrolase.
Peutz-Jeghers Syndrome: A rare genetic disorder characterized by the development of numerous benign nodules on the inside lining of the intestinal wall as well as excess skin pigmentation usually around the lips and inner lining of the mouth.
Portal hypertension: High blood pressure that occurs in the veins leading to the liver. It is usually a result of some sort of liver disease or problem.
Strongyloidiasis: A parasitic infectious disease involving the intestines and caused by the nematode Strongyloides stercoralis. Infection usually occurs in crowded, unsanitized populations.