A colorectal polyp is a growth on the lining of the colon or rectum.
Polyps of the colon and rectum are usually benign. This means they are not cancerous and do not spread. You may have one or many polyps. They become more common with age.
Common polyp types include:
- Adenomatous polyps - which may develop into colon cancer over time.
- Hyperplastic polyp - which usually do not develop into colon cancer.
- Serrated polyps - less common but may develop into colon cancer over time
Polyps bigger than 1 centimeter have a higher cancer risk than polyps smaller than 1 centimeter. Risk factors include:
- Family history of colon cancer or polyps
- A type of polyp called villous adenoma
Polyps may also be linked to some inherited disorders, including:
- Familial adenomatous polyposis (FAP)
- Gardner syndrome (a type of FAP)
- Juvenile polyposis (disease that causes many benign growths in the intestine)
- Lynch syndrome (HNPCC; disease that raises the chance of many types of cancer, including in the intestine)\
- Peutz-Jeghers syndrome (disease that causes intestinal polyps)
Polyps usually do not have symptoms. When present, symptoms may include:
- Blood in the stools
- Diarrhea (rare)
- Fatigue caused by losing blood over time
Colorectal polyps should be removed because some can develop into cancer. In most cases, the polyps may be removed during a colonoscopy.
For people with adenomatous polyps, new polyps can appear in the future. You should have a repeat colonoscopy usually 1 to 10 years later, depending on:
- Your age and general health
- Number of polyps you had
- Size and type of the polyps
In rare cases, when polyps are very likely to turn into cancer, the doctor will recommend a colectomy. This is surgery to remove part of the colon that has the polyps.
Outlook is excellent if the polyps are removed. Polyps that are not removed can develop into cancer over time.
When to Contact a Medical Professional
Call your health care provider if you have:
- Blood in a bowel movement
- Change in bowel habits
To reduce your risk of developing polyps:
- Eat foods low in fat and eat more fruits, vegetables, and fiber.
- Do not smoke or drink alcohol in excess.
- Maintain a normal body weight.
- Get regular exercise.
Your healthcare provider can order a colonoscopy or other screening tests:
- These tests help prevent colon cancer by finding and removing polyps before they become cancer. This may reduce the chance of developing colon cancer, or at least help catch it in its most treatable stage.
- Most people should begin these tests at age 50. Those with a family history of colon cancer or colon polyps may need to be screened at an earlier age or more often.
Taking aspirin or similar medicines may help reduce the risk of new polyps. Be aware that these medicines can have serious side effects if taken for a long time. Side effects include bleeding in the stomach or colon and heart disease. Talk with your doctor before taking these medicines.
Intestinal polyps; Polyps - colorectal; Adenomatous polyps; Hyperplastic polyps; Villous adenomas; Serrated polyp; Serrated adenoma
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Itzkowitz SH, Potack J. Colonic polyps and polyposis syndromes. In: Feldman M, Friedman LS, Brandt LJ, eds. Sleisenger and Fordtran's Gastrointestinal and Liver Disease Pathophysiology/Diagnosis/Management. 9th ed. Philadelphia, PA: Elsevier Saunders; 2010:chap 122.
Lieberman DA, Rex DK, Winawer SJ, et al., United States Multi-Society Task Force on Colorectal Cancer. Guidelines for colonoscopy surveillance after screening and polypectomy: a consensus update by the US Multi-Society Task Force on Colorectal Cancer. Gastroenterology. 2012;143:844-857. http://www.ncbi.nlm.nih.gov/pubmed/22763141
National Comprehensive Cancer Network. NCCN Clinical Practice Guidelines in Oncology (NCCN Guidelines): Colorectal cancer screening. Version 1.2014. Available at http://www.nccn.org/professionals/physician_gls/pdf/colorectal_screening.pdf. Accessed December 12, 2014.
Update Date 12/12/2014
Updated by: Jenifer K. Lehrer, MD, Department of Gastroenterology, Frankford-Torresdale Hospital, Aria Health System, Philadelphia, PA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.