Ulcerative colitis is a condition in which the lining of the large intestine (colon) and rectum become inflamed. It is a form of inflammatory bowel disease (IBD). Crohn disease is a related condition.
Inflammatory bowel disease - ulcerative colitis; IBD - ulcerative colitis
The cause of ulcerative colitis is unknown. People with this condition have problems with the immune system. However, it is not clear if immune problems cause this illness. Stress and certain foods can trigger symptoms, but they do not cause ulcerative colitis.
Ulcerative colitis may affect any age group. There are peaks at ages 15 to 30 and then again at ages 50 to 70.
The disease can begin in the rectal area. It may involve the entire large intestine over time. It may also start in the rectum and other parts of the large intestine at the same time.
Risk factors include a family history of ulcerative colitis or other autoimmune diseases, or Jewish ancestry.