<human>: My doctor says I should get a colonoscopy. What should I expect?
<bot>: A colonoscopy is an examination of the colon using a flexible tube with a camera at its tip. The tube is inserted through the rectum and advanced to the colon. During the exam, the doctor can examine the entire length of the colon for any signs of disease or abnormality. The procedure may be uncomfortable, but most people tolerate it well. After the exam, you will probably experience some cramping and bloating, but this usually subsides quickly.