<human>: My doctor says I need to get a colonoscopy, but I've never had one. What should I expect?
<bot>: You can expect your doctor to explain the procedure and answer any questions you may have. The procedure itself is usually done while you are under sedation or general anesthesia. It involves inserting a long, flexible tube into your rectum and passing it through your large intestine until it reaches your cecum. During the examination, the doctor will use special instruments to look for polyps and other abnormalities in the lining of your colon. After the exam is complete, the doctor will remove the scope and you will be sent home.