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Grand Strand Medical Center
South Strand Medical Center

Conditions InDepth: Irritable Bowel Syndrome (IBS)

Irritable bowel syndrome (IBS) is a chronic intestinal disorder that causes 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. Past names for this disorder include colitis, mucous colitis, spastic colon, spastic bowel, and functional bowel disease.

The Intestines
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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:

  • Ordinary events such as eating or bloating from gas-producing foods
  • Certain foods such as milk products, chocolate, alcohol, caffeine, carbonated drinks, and fatty foods, or simply larger meals
  • Stress
  • Emotional conflict
  • Menstrual periods

IBS is a common condition affecting 10%-20% of American adults.

What are the risk factors for irritable bowel syndrome?What are the symptoms of irritable bowel syndrome?How is irritable bowel syndrome diagnosed?What are the treatments for irritable bowel syndrome?Are there screening tests for irritable bowel syndrome?How can I reduce my risk of irritable bowel syndrome?What questions should I ask my doctor?What is it like to live with irritable bowel syndrome?Where can I get more information about irritable bowel syndrome?

Revision Information

  • Reviewer: Daus Mahnke, MD
  • Review Date: 12/2015 -
  • Update Date: 12/20/2014 -
  • Fauci AS, Braunwald E, et al. Harrison's Principles of Internal Medicine. 4th ed. New York, NY: The McGraw-Hill Companies; 2000.

  • IBS. American Gastroenterological Association website. Available at: Accessed December 18, 2015.

  • Irritable bowel syndrome (IBS). EBSCO DynaMed website. Available at: Updated September 1, 2015. Accessed December 18, 2015.

  • Irritable bowel syndrome (IBS). Merck Manual Professional Version website. Available at: Updated July 2013. Accessed December 18, 2015.