A flexible sigmoidoscopy is a procedure that can be performed in an office setting. It involves a thin small hollow fiber optic scope with a camera attached to the end of it that is introduced into the rectum and the lower third of the colon can be examined visibly by the doctor. It may be uncomfortable as air is instilled into the rectum and lower colon, but no anesthesia is required. A flexible sigmoidoscopy does not visualize the upper parts of the colon and a colonoscopy is indicated to determine if there are any polyps in the upper part of the colon. A Fleet enema is often required in preparation for the procedure.