Crohn's disease is a form of inflammatory bowel disease (IBD). It usually affects the intestines, but may occur anywhere from the mouth to the end of the rectum (anus).
Inflammatory bowel disease - Crohn's disease; Regional enteritis; Ileitis; Granulomatous ileocolitis; IBD- Crohn's disease
Causes, incidence, and risk factors
While the exact cause of Crohn's disease is unknown, the condition is linked to a problem with the body's immune system response.
Normally, the immune system helps protect the body, but with Crohn's disease the immune system can't tell the difference between normal body tissue and foreign substances. The result is an overactive immune response that leads to chronic inflammation. This is called an autoimmune disorder.
People with Crohn's disease have ongoing (chronic) inflammation of the gastrointestinal tract. Crohn's disease may occur in any area of the digestive tract. There can be healthy patches of tissue between diseased areas. The inflammation causes the intestinal wall to become thick.
There are different types of Crohn's disease, depending on the part of the gastrointestinal tract that is affected. Crohn's disease may involve the small intestine, the large intestine, the rectum, or the mouth.
A person's genes and environmental factors seem to play a role in the development of Crohn's disease. The body may be overreacting to normal bacteria in the intestines.
The disease may occur at any age, but it usually occurs in people between ages 15 - 35. Risk factors include:
- Family history of Crohn's disease
- Jewish ancestry
Review Date: 12/13/2010
Reviewed By: George F Longstreth, MD, Department of Gastroenterology, Kaiser Permanente Medical Care Program San Diego, California. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.