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Endoscopy (esophagogastroduodenoscopy) is a procedure used to diagnose diseases of the upper GI tract, particularly the oesophagus, the stomach, and the duodenum. The procedure is sometimes combined with an ultra sound and helps diagnose digestive disorders, nausea, abdominal pain and cramping, celiac disease, gastritis etc. The upper endoscopy is a non-surgical procedure and lasts between 15 to 30 minutes. The patient will be administered a numbing spray to prevent gagging and may also ask for sedation if required. A thin flexible tube fitted with a camera is passed through the mouth and throat into the oesophagus, stomach, and upper part of the small intestine. The doctor views the pictures on a monitor and may collect samples of any ulcers present. Doctor may sometimes recommend an endoscopic retrograde cholangiopancreaticography, a form of endoscopy that also allows visual images of the pancreas, gall bladder etc.