Upper Endoscopy and Colonoscopy
Upper endoscopy lets your doctor examine the lining of the upper part of your gastrointestinal tract, which includes the esophagus, stomach and duodenum (first portion of the small intestine).
Your doctor will use a thin, flexible tube called an endoscope, which has its own camera lens and light source. This transmits the images to a video monitor. You might hear your doctor or other medical staff refer to upper endoscopy as upper GI endoscopy or esophagogastroduodenoscopy (EGD).
Colonoscopy
A colonoscopy is a medical test to help find potential problems, such as colorectal cancer or polyps. Polyps are small growths. They are not cancer, but they can turn into cancer. You might also have this test to look for the cause of bowel problems, including bleeding, a change in bowel movements, or other problems.