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Irritable bowel syndrome, sometimes called spastic colon, is a condition of the colon (sometimes also the rectum) where a person experiences lower abdominal pain, spasms, diarrhea, and constipation. IBS is not an inflammatory bowel disease. Typically, there is no structural abnormality in the organs of a person suffering from IBS, but they may avoid eating, or eat very little to reduce the symptoms typically brought on by digestion. As a result, many IBS sufferers are underweight and may require calorie supplements or weight gain supplements to maintain a healthy weight.