During this procedure an endoscope (a thin flexible tube with a camera and a light on the end) is guided down the esophagus under sedation and used to examine the esophagus, stomach, and the duodenum (the first part of the small intestine). Disorders that would be found by an EGD include: problems of the esophagus such as esophagitis from acid reflux, strictures, eosinophilic esophagitis, Barrett's esophagus, and esophageal varices; problems of the stomach such as ulcers and hiatal hernias; and problems of the small intestine such as duodenal ulcers or celiac disease. Esophageal strictures can be dilated to alleviate problems swallowing and esophageal varices can be band ligated. To perform an upper endoscopy the patient must not have eaten solid foods for 8 hrs beforehand, but it doesn't require a clean-out like a colonoscopy.