FAP is a rare condition that can run in families. It causes hundreds or thousands of small growths in the large bowel. These are called polyps (or adenomas). They usually start to appear when a person is in their teens. If the polyps are not treated, one or more of them will almost certainly develop into cancer (usually by the age of 40). To prevent this, many people affected by FAP decide to have surgery to remove the large bowel.
There are also other conditions that can cause different types of bowel polyps to grow. These conditions also run in families. They include:
- MUTYH-associated polyposis (MAP)
- juvenile polyposis syndrome
- Peutz-Jeghers syndrome
- serrated polyposis syndrome.
These conditions are extremely rare. Your specialist doctor can give you more information if you need it.