Ulcerative colitis is an inflammatory bowel disease that causes long-lasting inflammation and ulcers in your digestive tract. Ulcerative colitis affects the innermost lining of your large intestine and rectum. Symptoms usually develop over time, rather than suddenly.
Symptoms include diarrhea (often with blood or pus), abdominal pain or cramping, rectal pain, rectal bleeding, urgency to defecate, weight loss, fatigue, and fever.
The exact cause of ulcerative colitis remains unknown. Previously, diet and stress were suspected, but now doctors know that these factors may aggravate but don’t cause ulcerative colitis.