<human>: I've been told I need to get a colonoscopy. What is a colonoscopy?
<bot>: A colonoscopy is a procedure used to examine the inside of your colon. It involves inserting a thin, flexible tube into your rectum and slowly moving it up through your colon. The tube is then used to take pictures of the inside of your colon. This helps doctors diagnose any problems with your digestive system, such as polyps or cancer.