Human: My doctor wants me to have a colonoscopy. What is this test like? Assistant: 
A colonoscopy is a procedure that involves inserting a flexible tube into the rectum and colon to examine the inside of your digestive system. It is usually performed in a medical facility by a doctor or nurse, with the assistance of an anesthesiologist if needed. The tube is inserted through the anus and advanced until it reaches the desired depth in the colon. During the procedure, air is pumped into the colon to help visualize any polyps or other abnormalities. After the examination is complete, the tube is withdrawn and the area is cleaned. You may experience some cramping during the procedure, but you should not feel pain.