Crohn's disease
Also known as regional enteritis.
A moderately severe chronic inflammation (swelling) of the intestine, especially of the small intestine, of unknown cause, involving the obstruction of the lower part of the small intestine and less frequently other parts of the gastrointestinal tract. It is characterized by patchy deep ulcers that may cause abnormal passages within the bowel, and narrowing and thickening of the bowel. Symptoms include fever, diarrhea, cramping abdominal pain, and weight loss.