Colonoscopy vs. Sigmoidoscopy: What’s the Difference? If your doctor wants to check the health of your colon — whether as part of a routine screening or to investigate a concern — they may recommend a ...

A colonoscopy examines the bowels using a colonoscope, a thin, flexible tube with a light and camera. It can help identify issues like colorectal cancer, polyps, and ulcers. Doctors use colonoscopies ...