An inflammatory bowel disease involving the mucosal surface of the large intestine and rectum. It may present with an acute or slow onset and follows an intermittent or continuous course. Signs and symptoms include abdominal pain, diarrhea, fever, weight loss, and intestinal hemorrhage. The disease is MONDO_0005101 (ulcerative colitis). Also known as: colitis ulcerative, ulcerative colitis (disease).