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Guide. An upper gastrointestinal (UGI) endoscopy is a procedure that allows your doctor to look at the inside lining of your esophagus, your stomach, and the first part of your small intestine (duodenum).
Upper GI endoscopy is the endoscopic examination of the upper portion of gastrointestinal tract by endoscope for diagnosing or treating any disease of this area. It is a procedure performed by a gastroenterologist, who uses the endoscope to diagnose and, in some cases, treat problems of the upper digestive system. The procedure is used to discover the problems for swallowing difficulties, bleeding, indigestion, abdominal pain, nausea, vomiting, reflux, or chest pain.