During a colonoscopy, a specialist in digestive health called a gastroenterologist will carefully examine your colon and rectum for any abnormalities. They do this using a long and thin tube called a scope, which has a camera at the end. The scope allows the doctor to see the inside of your colon. The procedure is typically performed at a specialized center called an endoscopy center. Before the procedure begins, you will be given medication through an intravenous line (IV) to help you relax and feel comfortable. Alternatively, you may have the option to use a pain relief method called ENTONOX or gas and air. This will help manage any discomfort during the procedure. Once you are sedated or using ENTONOX, the doctor will gently insert the scope into your rectum and slowly move it through your colon. They will take images or videos of the colon as they go along. The procedure usually takes around 20 to 30 minutes to complete.