[narrator] it is. it's the second leading cancer killer in the u.s. i don't have symptoms. [narrator] it doesn't always cause symptoms, especially early on. and screening helps prevent the disease. oh? how? [narrator] by finding precancerous polyps so they can be removed. but that test. [narrator] there's more than one screening test. if you're 50 or older, talk to your doctor about which one is right for you. colorectal cancer screening really does save lives.