2.1
Crohn's disease is a chronic inflammatory condition affecting the gastrointestinal tract (gut). It can affect any part of the gut from the mouth to the anus. The lining of the affected area becomes inflamed and may be ulcerated, and the wall of the intestine thickens. The clinical features of Crohn's disease vary and are determined partly by the site of the disease. Symptoms include diarrhoea, abdominal pain, weight loss, malaise, lethargy, anorexia, nausea, vomiting and fever.