Gastroenterology

Gastroenterology is a medical field which focuses on the digestive system and its disorders. The name comes from Ancient Greek, with gaste/gastros meaning stomach, enteron meaning intestine and logos meaning reason.
Doctors who specialize in this field are called gastroenterologists, and they generally complete the full eight years of pre and medical education, as well as a yearlong internship, and three years of residency. These are followed by three more years in a gastroenterology fellowship. Those who specialize in GI radiology, hepatobiliary or gastric medicine, or in GI oncology, usually have another two or three years in a fellowship.
Hepatology, though generally considered part of the same field, is actually a sub-specialty. This study focuses on the liver, pancreas and biliary tree.