Harvard Women's Health Watch

Making smart screening decisions: Colon cancer screening

Colorectal cancer is the third most common cancer among men and women. Several tests can find hidden colorectal cancer while it is still small and treatable. These include colonoscopy, flexible sigmoidoscopy, CT colonography, fecal occult blood test, and others. Testing should generally start at age 50, but women (and men) with a strong family history of colorectal cancer should talk with their doctors about having their first colonoscopy sooner than that. It's best to have a colonoscopy once every 10 years; a virtual colonoscopy, flexible sigmoidoscopy, or double-contrast barium enema once every five years; or a stool check for blood once a year.
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