An esophagogastroduodenoscopy (EGD) is an endoscopic procedure where a doctor places an endoscope into the mouth and advances it to the duodenum (the beginning of the small intestines). The endoscope is equipped with a light and a camera that produces a live feed of the procedure, allowing the doctor to examine the lining of the esophagus, stomach, and the first portion of the small intestine. An EGD is performed to diagnose gastrointestinal problems and to screen patients for esophageal cancer. MOT with chronic gastrointestinal symptoms can benefit from an EGD, as it will help identify a cause that can be used to develop an effective treatment plan.