American College of Gastroenterology
Information for physicians and patients on a variety of gastrointestinal topics.

American Gastroenterological Association
Resource for patients and physicians. Information about digestive diseases, MEDLINE access, physician locator service, meeting information for physicians, practice guidelines, and more.

American Liver Foundation
Information for patients and physicians on a wide range of subjects concerning hepatitis and other diseases of the liver.

American Society for Gastrointestinal Endoscopy
News for gastrointestinal endoscopists, case study of the month, meetings, publications.

Crohn’s and Colitis Foundation of America
Comprehensive information on Crohn’s disease and ulcerative colitis, plus an opportunity to ask physicians questions about inflammatory bowel diseases.

GI Endoscopy Atlas
Excellent reference presented by the Department of Internal Medicine of the University of Iowa. Contains endoscopic and radiographic images. Includes endoscopic ultrasound.

The web’s “largest collection of freely-available, full-text, clinical articles”.

Patient Information Documents on Digestive Diseases
Information for patients from the National Institute of Diabetes and Digestive and Kidney Diseases, of the National Institute of Health.