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National Institutes of Health - MedlinePlus
MedlinePlus is the National Institutes of Health's Web site for patients and their families and friends. Produced by the National Library of Medicine, it brings you information about diseases, conditions, and wellness issues in language you can understand.

American Gastroenterological Association
The AGA is the trusted voice of the gastrointestinal (GI) community. Founded in 1897, the AGA has grown to include 17,000 members from around the globe who are involved in all aspects of the science, practice and advancement of gastroenterology.

American College of Gastroenterology: GI Health and Disease
The mission of the American College of Gastroenterology shall be to advance the medical treatment and scientific study of gastrointestinal disorders, including serving the evolving needs of physicians in the delivery of high quality scientific, humanistic, clinical, ethical, and cost-effective health care to gastroenterology patients.