http://www.niddk.nih.gov/health/digest/summary/ibskids/index.htm
National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health
Irritable bowel syndrome (IBS) is a digestive disorder that causes abdominal pain, bloating, gas, diarrhea, and constipation--or some combination of these problems. IBS affects people of all ages, including children.