Familial adenomatous polyposis (FAP) is a rare, inherited condition that causes colorectal cancer. FAP results in the development of hundreds of polyps inside the large intestine.

Colon Polyp
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FAP is caused by a genetic defect. Polyps usually begin developing during during the teenage years, and 95% of people with FAP will have polyps by age 35. The average person with FAP will have colorectal cancer found by the age of 39 years.