A gastroenterologist is a physician who specializes in the gastrointestinal tract (including the esophagus, stomach, small intestine, and large intestine) and other digestive organs (liver, pancreas, bile ducts, and gall bladder). Gastroenterologists see patients in the hospital and clinic, and also perform endoscopic procedures (e.g., upper endoscopy and colonoscopy).
Gastroenterology (MeSH heading) is the branch of medicine focused on the digestive system and its disorders. Diseases affecting the gastrointestinal tract, which include the organs from the mouth into the anus, along the alimentary canal, are the focus of this specialty.