Dr Himesh Upadhyay on Instagram: "A colonoscopy is a medical procedure where a doctor uses a flexible tube with a camera to examine the inside of the large intestine (colon) and rectum. It is used to detect abnormalities like polyps or cancer, diagnose conditions like inflammatory bowel disease, and investigate symptoms such as unexplained pain or bleeding. The procedure involves inserting the camera through the anus and carefully examining the lining as the scope is advanced and then withdrawn.