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What I need to know about Irritable Bowel Syndrome
What I need to know about Irritable Bowel Syndrome Author:U.S. Department of Health and Human Services Irritable bowel syndrome* (IBS) is a functional gastrointestinal (GI) disorder, meaning that the symptoms are caused by changes in how the GI tract works. The GI tract is a series of hollow organs joined in a long, twisting tube from the mouth to the anus?the opening where stool leaves your body. Food is digested, or broken down, in the GI tract.