a chronic inflammatory disease of the intestine. Named after Burrill Crohn who described the disease in 1932. It usually affects persons in their teens or early twenties. It tends to be a chronic, recurrent condition withperiods of remission and exacerbation. In the early stages, there are small scattered shallow crater-like areas (erosions) called apthous ulcers in the inner surface of the bowel. With time, deeper and larger ulcers develop, causing scarring and stiffness of the bowel. The bowel becomes increasingly narrowed, leading to obstruction. Deep ulcers can puncture holes in the bowel wall, leading to infection in the abdominal cavity (peritonitis)and in adjacent organs. When only the large intestine (colon) is involved, the condition is called crohns colitis. When only the small intestine is involved, the condition is called Crohn's enteritis. When only the end of the small intestine (the terminal ileum) is involved, it is termed terminal ileitis.When both the small intestine and the large intestine are involved, the condition is called crohns enterocolitis (or ileocolitis). Abdominal pain, diarrhoea, vomiting, fever, and weight loss can be symptoms. Crohns disease can be associated with reddish tender skin nodules, and inflammation of the joints, spine, eyes, and liver. Diagnosis is by barium enema, barium x-ray of the small bowel, and colonoscopy. Treatment includes medications for inflammation, immune suppression, antibiotics, orsurgery. (The disease is also called granulomatous enteritis or regionalenteritis).