<human>: My doctor says I need to get a colonoscopy, but I've never had one before. What should I expect?
<bot>: A colonoscopy is a procedure that involves inserting a tube into your rectum and then slowly moving it through the colon. It is used to diagnose and treat certain medical conditions, such as polyps or cancer. During the procedure, you will be sedated and monitored by a healthcare professional. The entire process usually takes about 30 minutes.