Ulcerative colitis is a chronic inflammatory bowel disease affecting the large intestine, resulting from the immune system attacking its own tissues. This condition is characterized by inflammation of the colon, rectum, or both. The resulting inflammation leads to the formation of small sores (ulcers) on the inner surface of the large intestine. These ulcers can cause bleeding and pus production. This inflammation in the large intestine accelerates bowel movements and leads to frequent urges to defecate, causing abdominal pain and diarrhea. Ulcerative colitis is not related to stomach ulcers; these two conditions affect different organs and arise from different causes. The treatment and symptom management of ulcerative colitis require a different medical approach than that for stomach ulcers.