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UC is a type of inflammatory bowel disease (IBD) in which the inner lining of the rectum and part (or all) of the colon can be affected by inflammation.

The cause of UC is unknown. Research points to multiple factors that may play a role, such as your genes, the environment, and how your immune system works.

How many adults does UC affect? Click for answer

UC affects about 2 in every 1,000 adults in the US and men and women equally. Return to question

UC is most common in North America and Europe. In the US and Europe, people of Jewish descent are approximately 3 times more likely to have UC than those of other ethnic backgrounds.