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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).
An endoscopy is a procedure used to find the cause of the narrowing of your esophagus. Healthcare providers use an endoscope to examine your esophagus. An endoscope is a bendable tube with a light and camera on the end.