Which specialist works with the gi system?

Answer 1

Gastroenterology - the diagnosis and treatment of diseases and disorders of the digestive system, including the liver, stomach and intestines, and medical conditions such as ulcers, tumors and colitis

from Glossary of Medical Specialties

http://www.somersetmedicalcenter.com/body.cfm?id=476

Answer 2

There are several specialists who work with the GI system whom you would visit, depending on the problem you have. There are GI doctors, specialists, gastroenterology specialists, gastrointestinal specialists, GI physicians, and more.

Answer 3

A medical doctor whose specialization is called gastroenterology.

This kind of doctor is called a gastroenterologist.