Most cases begin as polyps, which are small growths inside the colon or rectum. Colon polyps are very common. Some polyps can turn into cancer. But doctors can't tell ahead of time which polyps will turn into cancer. This is why people age 50 and older need regular tests to find out if they have any polyps and then have them removed.
Some people who are younger than 50 need regular tests if their medical history puts them at increased risk for colorectal cancer.
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WebMD Medical Reference from Healthwise
November 14, 2014
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