<human>: My doctor says that I need to get a colonoscopy. What does that mean and how often do I need to do it?
<bot>: A colonoscopy is a procedure in which a doctor uses a long, flexible tube called a colonoscope to examine the inside of your colon. It’s done by inserting the tube into the rectum and then slowly advancing it through the colon. During the exam, the doctor can look for signs of cancer, polyps (abnormal growths), or other problems. The test takes about 30 minutes to perform. Afterward, you may be given a laxative to help cleanse your colon before the procedure. You should plan to stay at the hospital for 1-2 hours after the procedure.