The genetic identity of an individual that does not show as outward characteristics.

See gastroesophageal reflux disease.

An infection of the parasite Giardia lamblia caused by spoiled food or unclean water. It can cause diarrhea. See gastroenteritis.

A buildup of bilirubin in the blood caused by the lack of a liver enzyme needed to break it down. See bilirubin.

See celiac disease.

The solid waste that passes through the rectum as a bowel movement. Feces are undigested food, bacteria, mucus, and dead cells. Also called stool.

See intestines.

Medicines that reduce the amount of acid the stomach. Histamine2 (H2) signals the stomach to make acid.

A protein found in wheat, rye, barley, and to a lesser degree, oats. In people with celiac disease, gluten damages the lining of the small intestine or causes sores on the skin. See celiac disease.

A type of immune reaction seen in some diseases in which the body encapsulates the offending substance.