Bowel polyps are small growths on the inner lining of the large intestine (colon) or rectum. Bowel polyps are very common, affecting around 1 in 4 people aged 50 or over. They're slightly more common in men. Some people develop just 1 polyp, while others may have a few.

Are rectal polyps usually cancerous?

Polyps themselves usually aren't cancer. The most common types of polyps in your colon and rectum include: Hyperplastic and inflammatory polyps. These usually don't carry a chance of cancer.

What percentage of rectal polyps are cancerous?

Approximately 1% of polyps with a diameter less than 1 centimeter (cm) are cancerous. If you have more than one polyp or the polyp is 1 cm or bigger, you're considered at higher risk for colon cancer. Up to 50% of polyps greater than 2 cm (about the diameter of a nickel) are cancerous.