An upper GI endoscopy can be used to identify disorders or problems such as: GERD (gastro esophageal reflux disease), Peptic ulcer disease (gastric and duodenal), Gastritis, Narrowing (strictures) or blockages. Larger than normal veins in your esophagus (esophageal varices), stomach/duodenal  cancers or tumors,

This is also known as colonoscopy.  The procedure is used as a screening test in individuals with no symptoms, or to help diagnose unexplained abdominal pain, rectal bleeding, or a change in bowel habits like irritable bowel disease/syndrome, diverticulosis, hemorrhoids, colon cancers etc.