Physician Specialty Descriptions Following is a list of physician specialties followed by descriptions. Once you find the specialty you are looking for, click on one of the following links to find a physician. Find a physician by specialty Find a physician by name Custom search         Using This Directory: Click on the black triangle on the title bar to change the sort order. Click on a blue triangle to expand or collapse that category. Specialty Description Gastroenterology is a medical subspecialty concentrating on the digestive organs involving the stomach, bowels, liver, and gallbladder. The Gastroenterologist treats conditions such as abdominal pain, ulcers, diarrhea, cancer, and jaundice. Gastroenterologists perform complex diagnostic and therapeutic procedures using lighted scopes to see internal organs.