Gastro- : A combining form from the Gr. /, /, the stomach, or belly; as in gastrocolic, gastrocele, gastrotomy.

Example:
What Auto immune diseases have gastro problems as the main symptom?

Taxonomy
Gastro, ERCP, Gastroenterology, March 19, Gastroenterology and Hepatology, Professor of Medicine, Search, A Home, Martin, L. Freeman, Interim Director, Nutrition, Joseph C, AGAF, FACP, Michael, P. Chase, Chase, MD.

Defination from the web:
Society of physicians and scientists that serves as an advocate for its members and their patients; supports members' practices and scientific needs; and promotes the research and application of new knowledge leading to digestive disease ...