Online Resource Center

General GI Information

National Digestive Diseases Information Clearinghouse

Mission: Provides information about digestive diseases to people with digestive disorders and to their families, health care professionals, and the public. The NDDIC answers inquiries, develops and distributes publications, and works closely with professional and patient organizations and Government agencies to coordinate resources about digestive diseases.


Celiac Disease

American Celiac Disease Alliance (ACDA)

Mission: To represent and advocate on behalf of the entire celiac community—patients, physicians, researchers, and food manufacturers and other service providers.

Celiac Disease Foundation (CDF)

Mission: To develop awareness and improve the quality of medical and self-care for celiac disease/dermatitis herpetiformis and to provide telephone information and referral services, free information, medical advisory board, and special educational seminars and general meetings.

Celiac Support Association/USA, Inc. (CSA)

Mission: To provide information and educational materials for people with celiac sprue and dermatitis herpetiformis and for parents of children with celiac disease. Made up of six regions with chapters and resource units across the United States.

National Foundation for Celiac Awareness (NFCA)

Mission: To raise awareness of celiac disease and funding to advance research, education, and screening and to improve the quality of life of children and adults affected by this autoimmune disease through grant making and direct programming.


Liver Disorders

American Association for the Study of Liver Diseases (AASLD)

Mission: To advance the science and practice of hepatology, thereby promoting liver health and optimal care of patients with liver and biliary tract diseases.

Hepatitis B Foundation

Mission: To raise public awareness, provide information and support, fund cure-focused research on hepatitis B, and promote prevention. The Hepatitis B Foundation is a voluntary nonprofit organization.

American Liver Foundation (ALF)

Mission: To promote liver health and liver disease prevention. The ALF provides research, education, and advocacy for those affected by liver-related diseases, including hepatitis.

United Network for Organ Sharing (UNOS)

Mission: To advance organ availability and transplantation by uniting and supporting its communities for the benefit of patients through education, technology, and policy development.


Crohn’s and Colitis

Crohn’s & Colitis Foundation of America (CCFA)

Mission: To cure and prevent Crohn’s disease and ulcerative colitis through research and to improve the quality of life of children and adults affected by these digestive diseases through education and support.


Irritable Bowel Syndrome

International Foundation for Functional Gastrointestinal Disorders

Mission: To inform, assist, and support people affected by gastrointestinal disorders. The IFFGD is a nonprofit education and research organization.



American Dietetic Association (ADA) 

Mission: To promote optimal nutrition and well-being for all people by advocating for its members.


Professional Societies

American College of Gastroenterology (ACG)

Mission: To serve clinical and scientific information needs of member physicians and surgeons who specialize in digestive and related disorders. Emphasis is on clinical practice, teaching, and research.

American Gastroenterological Association (AGA)

Mission: To serve as an advocate for the AGA’s members and their patients, to support members’ practice and scientific needs, and to promote the discovery, dissemination, and application of new knowledge leading to the prevention, treatment, and cure of digestive diseases.

American Society for Gastrointestinal Endoscopy (ASGE)

Mission: To provide information, training, and practice guidelines about gastrointestinal endoscopic techniques.