<human>: I've never had a colonoscopy. I'm worried about the procedure. What should I expect?
<bot>: Colonoscopy is an examination of the large intestine and rectum, which involves inserting a long flexible tube with a camera on the end into the rectum. The doctor will examine the lining of the rectum and remove any polyps or other growths that are found. You may feel some discomfort during the procedure, but it should be relatively painless. Afterward you may experience cramping, bloating, gas, and diarrhea for several days. If these symptoms are severe, contact your doctor immediately.