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/

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

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

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/

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

Johns Hopkins Gastroenterology and Hepatology
- Comprehensive, highly illustrated, current 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/

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

GI/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

About Bowel Incontinence
- Support and reliable information about causes and treatment of this surprisingly common disorder.
- http://www.aboutincontinence.org

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.org