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 is a telescopic and visual examination of the colon and rectum. It helps doctors detect abnormalities in the bowel, including signs of colorectal cancer, polyps, unexplained diarrhea, ...