Irritable bowel syndrome (IBS) is a chronic intestinal disorder causing abdominal pain, cramping, gas, and bloating, in addition to bouts of diarrhea or constipation. IBS does not cause inflammation or permanent harm, nor does it progress to more serious conditions. It can, nevertheless, be very distressing. Past names for this disorder include colitis, mucous colitis, spastic colon, spastic bowel, and functional bowel disease.
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The exact cause of IBS is not known. There may be several causes, and IBS may itself be a collection of different conditions, each having a different cause. IBS is placed in a class of diseases known as "functional disorders," a term that means no structural, biochemical, or infectious cause has yet been found.
Possible triggers for IBS include:
IBS afflicts 10%-20% of American adults, generating over 3 million yearly visits to physicians and comprising a quarter to a half of all visits to gastroenterologists. Over 60% of people with IBS are women.
American Gastroenterological Association website. Available at: http://www.gastro.org. Accessed March 3, 2006.
Fauci AS, Braunwald E, et al. Harrison's Principles of Internal Medicine. 4th ed. New York, NY: The McGraw-Hill Companies; 2000.
Last reviewed December 2013 by Daus Mahnke, MD
Last Updated: 01/15/2013