the cause of ulcerative colitis is unknown. studies suggest that this and other inflammatory bowel diseases may result from an abnormal response by the body's immune system to normal intestinal bacteria. 1 disease-causing bacteria and viruses also may play a role in causing the condition. ulcerative colitis can run in families-some people may have a genetic tendency to have it. webmd medical reference from healthwise this information is not intended to replace the advice of a doctor. healthwise disclaims any liability for the decisions you make based on this information. © 1995-2011 healthwise incorporated. healthwise healthwise for every health decision and the healthwise logo are trademarks of healthwise incorporated.
what causes ulcerative colitis?