NeuroGastroenterology and Gastrointestinal Motility 
Promotes research, education and care of visceral dysfunctions, such as : nausea, vomiting, constipation, and diarrhea in patients with nervous system alterations.
http://www.anemgi.orgGI/Nutrition Section, University of Chicago
Information for patients, nurses, and physicians about GI/Nutritional diseases and disorders. Description of services offered at the University of Chicago Medical Center, Section of GI/Nutrition.
http://gi.bsd.uchicago.edu
Ask The Doctor : The Gastroenterology Forum
Interactive medical question and answer format about all gastroenterology conditions. Patient questions are replied to by online doctors. Library and archive of articles on stomach, intestine, liver diseases.
http://www.medhelp.org/perl6/gastro/index.htm
Johns Hopkins Gastroenterology and Hepatology
Information on the causes, diagnosis and treatment of digestive diseases, clinical and basic science research at Johns Hopkins.
http://hopkins-gi.org/pages/latin/templates/
About Digestion and Crohn's Disease
Doctor-produced, peer-reviewed articles about Crohn's, irritable bowel syndrome, ulcerative colitis, and related conditions.
http://www.about-digestion.com
GI Surgery and Procedures
Support group that deals with upper and lower gastro-intestinal surgeries and procedures. Includes joining instructions.
http://groups.yahoo.com/group/gisurgeryandprocedures/
Peutz-Jeghers Syndrome
Offers information on this rare disorder characterized by hamartomas and high risk for cancer. For patients, family, friends, and medical personnel.
http://www.peutz-jeghers.com
RadiologyInfo: Lower GI Radiography
Explains procedures, what patients might experience, how to prepare for exams, benefits, and risks.
http://www.radiologyinfo.org/en/info.cfm?pg=lowergi
Foodreactions.org
Describes the differences between nutritional intolerances and true allergies, with details of symptoms, and suggestions for avoiding or coping with them.
http://www.foodreactions.org/
