A gastroenterologist treats esophagus problems, according to Mayo Clinic. Gastroenterologists are physicians with specialized training in diagnosing and treating disorders of the digestive system, such as the pancreas, esophagus and small intestine.
Gastroenterologists can perform procedures such as endoscopy, colonoscopy, endoscopic ultrasonography and small bowel enteroscopy, state Mayo Clinic. Physicians who want to specialize in gastroenterology must first receive certification in internal medicine, notes the American Board of Internal Medicine. They must then complete a fellowship in gastroenterology at an accredited United State or Canadian program and pass a certification exam. Fellows receive a minimum of 36 months of training with 18 months of clinical work before becoming a gastroenterologist.