Putting fears to rest Colon and rectal cancers are second only to lung cancer as the leading causes of cancer-related deaths in the United States. But with screening exams like colonoscopy colorectal cancer often can be prevented. And if detected early, it's usually treatable. If even the thought of a colonoscopy exam makes you feel a bit queasy, remember that it just might save your life.
Most colorectal cancers begin in the form of a polyp.
And nearly half of all Americans will form at least one colon or rectal polyp during their lifetime, about one-tenth of which may become cancerous. By detecting and removing precancerous polyps which may not bleed or cause other symptoms colon cancer can be prevented. One reason for this is that colonoscopy screens the entire colon, instead of just the lower portion. Moreover, polyps can often be removed during the colonoscopy procedure without further surgery. Because colonoscopy has a higher cost and a slightly higher risk of complications than other tests of similar purpose, you may be advised to have the other screening tests if you're considered to be only at average risk for colorectal cancer.