Certain disorders of the lower gut can result in substantial bleeding. Polyps , small wartlike tumors that arise from the wall of the colon can become cancerous and should be removed. Electric current is then applied to cut off the polyp cleanly, with cauterization to prevent bleeding. Once again you cannot feel any of these treatments. Foreign bodies that have been intentionally or accidentally inserted into the rectum may also be removed during colonoscopy without the need for surgery.
Some doctors use special lasers to treat blockages from tumors.
There are other therapies, which may be performed at the time of colonoscopy, and you should discuss these with your doctor prior to your procedure. Although colonoscopy is a frequently used modality for diagnosing and treating a number of GI disorders, no medical technique is completely safe and there are potential complications with colonoscopy. There is a small risk of having a reaction to the medications used for sedation or to any antibiotics that may be given prior to the procedure. You will be monitored closely during the procedure and there are medications that will reverse some of the adverse effects of those medications used during the procedure if necessary. There is a small risk of infection.