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Health Encyclopedia

Health Encyclopedia

An invaluable resource of health information.

Colorectal polyps

A colorectal polyp is a growth that sticks out of the lining of the colon or rectum.

  • Alternative Names

    Intestinal polyps; Polyps - colorectal; Adenomatous polyps; Hyperplastic polyps; Villous adenomas

  • Causes, incidence, and risk factors

    Polyps of the colon and rectum are usually benign. There may be single or many polyps, and they become more common as people age.

    Over time, certain types of polyps, called adenomatous polyps, may develop into colon cancer. Another common type of polyp found in the colon is called a hyperplastic polyp, which usually does not develop into colon cancer.

    Polyps bigger than 1 centimeter have a greater cancer risk than polyps under 1 centimeter. Risk factors include:

    • Age
    • Family history of colon cancer or polyps
    • A type of polyp called villous adenoma

    Polyps may also be associated with some inherited disorders, including:

  • Symptoms

    There are usually no symptoms. However, the following symptoms may occur:

    • Abdominal pain (rare)
    • Bloody stools
    • Fatigue associated with anemia
    • Rectal bleeding
  • Signs and tests

    A rectal examination may rarely reveal a polyp that can be felt by the health care provider. However, the physical exam is usually normal.

    Tests that show polyps include:

  • Treatment

    Over time, adenomatous colorectal polyps can develop into cancer and should be removed. In most cases, the polyps may be removed at the same time a colonoscopy is performed. For patients with polyps, follow-up colonoscopy should be performed within 3 - 5 years to see if the polyps have returned.

    Rarely, for polyps with a high potential of becoming cancerous, the health care provider may recommend a colectomy (removal of a part of the colon).

  • Expectations (prognosis)

    The outlook for patients with colorectal polyps is excellent, assuming the polyps are removed. Polyps that are left behind can develop into cancer over time.

  • Complications

    Polyps can cause bleeding, and over time, can develop into cancers.

  • Calling your health care provider

    Call your health care provider if you have

    • Black, tar-like stools
    • Blood during a bowel movement
    • Change in bowel habits
  • Prevention

    The following is recommended to reduce the risk of developing polyps:

    • Eat a diet low in fat and high in fruits, vegetables, and fiber
    • Avoid smoking and excessive alcohol intake
    • Maintain a normal body weight

    Colonoscopy prevents colon cancer by removing polyps before they can become cancer. People over age 50 should have a colonoscopy screening, which makes earlier diagnosis and treatment possible. This may reduce the odds of developing colon cancer, or at least help catch it in its most treatable stage. Those with a family history of colon cancer or colon polpys may need to be screened at an earlier age.

    See physical exam frequency for further recommendations about having a screening test.

  • References

    Lieberman DA. Clinical practice. Screening for colorectal cancer. N Engl JMed. 2009 Sep 17;361(12):1179-87.

Review Date: 11/5/2009

Reviewed By: David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc., and Yi-Bin Chen, MD, Leukemia/Bone Marrow Transplant Program, Massachusetts General Hospital.

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- 2014 A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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