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

See gastrointestinal tract.

See gastroesophageal reflux disease.

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

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

An amino acid needed for maintaining health of the intestinal lining.

A constant feeling of a lump in the throat that is usually related to stress.

A simple sugar the body manufactures from carbohydrates in the diet. Glucose is the body

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 general term that refers to celiac disease and dermatitis herpetiformis.