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A gastroenterologist is a physician who specializes in disorders of the gastrointestinal tract, the organ system responsible for consuming and digesting food, absorbing nutrients, and getting rid of waste. A patient who is experiencing problems with their stomach, esophagus, liver, intestines, gallbladder or pancreas may visit a gastroenterologist. In treating patients, a gastroenterologist can also educate them on irritable bowel syndrome (IBS), celiac disease, acid reflux and Crohn's disease.