American Gastroenterological Association
This is a site of the American College of Physicians, one of the most important associations for internists. No registration required.

American College of Gastroenterology
A wealth of knowledge for free. Registration is required.

American Society of Gastrointestinal Endoscopy (ASGE)
ASGE, with more than 12,000 members worldwide, promotes the highest standards for endoscopic training and practice, fosters endoscopic research, recognizes distinguished contributions to endoscopy, and is the foremost resource for endoscopic education.

National Institutes of Health
This is probably comprehensive site for excellent patient education in digestive     and other diseases.

North Carolina Society of Gastroenterology (NCSG)

Crohn’s and Colitis Foundation of America (CCFA)
The Crohn’s & Colitis Foundation of America (CCFA) is the leader in research, education and patient support for IBD (Crohn’s disease and ulcerative colitis).

North Carolina Medical Society
Physician organization devoted to representing the interests of physicians and protecting the quality of patient care.

Wake County Medical Society
Nonprofit organization serves physicians of the county.