Crohn's disease occurs most frequently in North America and Europe,
especially in the northern latitudes of these locations. It is rare in much of
South America and Africa (except for South Africa).1
Slightly more women than men have Crohn's disease. The disease tends
to affect younger people, with most diagnoses occurring between ages 15 and 30.
Another small peak of diagnosis occurs in people between 60 and 80 years of
The term inflammatory bowel disease (IBD) describes a group of disorders in which the intestines become inflamed. The likeliest cause is an immune reaction the body has against its own intestinal tissue.
Two major types of IBD are ulcerative colitis and Crohn's disease. Ulcerative colitis is limited to the colon or large intestine. Crohn's disease, on the other hand, can involve any part of the gastrointestinal tract from the mouth to the anus. Most commonly, though, it affects the small intestine...