Gastroenterology
Gastroenterology is a medical specialty devoted to the study, diagnosis, and treatment of disorders of the digestive system. These disorders may affect the esophagus (swallowing tube), stomach, small intestine, large intestine (colon), rectum, liver, gallbladder, or pancreas.
Gastroenterology is popularly (and incorrectly) known as "GI" (which stands for gastrointestinal).