Upper Gastrointestinal Endoscopy is a medical procedure that allows doctors to examine the upper part of the digestive system, including the esophagus, stomach, and the first part of the small intestine. A thin, flexible tube called an endoscope is inserted through the mouth and guided down the throat. This tube has a light and camera, enabling the doctor to view the lining of these organs on a monitor. The procedure is typically performed to investigate symptoms such as persistent heartburn, nausea, or difficulty swallowing. It can also be used to take biopsies, remove polyps, or treat certain conditions. Patients are usually given a sedative to help them relax during the procedure.