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[starttext]An upper GI endoscopy is a diagnostic procedure used by your doctor to inspect the inside of your throat, esophagus, stomach and upper intestine.
While it's considered a surgical procedure, endoscopy does not involve an incision. Instead, your doctor will pass a flexible tube, called an endoscope through your mouth and into your stomach and digestive tract.
This tube has a tiny video camera mounted on its tip,
it also contains a small tool used for taking tissue samples.
Because the passageway from the mouth to the opening of the small intestine is usually unobstructed, your doctor can use the endoscope to inspect the entire upper half of your digestive system.[endtext]