The American College of Gastroenterology is an organization of digestive disease specialists. The Web site contains information about common gastrointestinal problems.

The International Foundation for Functional Gastrointestinal Disorders is a nonprofit educational and research organization that provides information and support to people who have gastrointestinal disorders and to physicians. It provides information about irritable bowel syndrome and other conditions such as gastroesophageal reflux disease (GERD).

This clearinghouse is a service of the U.S. National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), part of the U.S. National Institutes of Health. The clearinghouse answers questions; develops, reviews, and sends out publications; and coordinates information resources about digestive diseases. Publications produced by the clearinghouse are reviewed carefully for scientific accuracy, content, and readability. The clearinghouse does not provide medical advice.