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Endometrial polyps

Endometrium is the lining of the inside of the womb (uterus). Overgrowth of this lining can create polyps. Polyps are fingerlike growths that attach to the wall of the uterus. They can be as small as a sesame seed or larger than a golf ball. There may be just one or many polyps.

Causes

The exact cause of endometrial polyps in women is not known. They tend to grow when there is more of the hormone estrogen in the body.

Most endometrial polyps are not cancerous. Very few can be cancerous or precancerous. The chance of cancer is higher if you are postmenopausal, on Tamoxifen, or have heavy or irregular periods.

Other factors that may increase the risk for endometrial polyps are:

  • Obesity
  • Tamoxifen, a treatment for breast cancer
  • Postmenopausal hormone replacement therapy
  • Family history of Lynch syndrome or Cowden syndrome (genetic conditions that run in families)

Endometrial polyps are common in women between 20 to 40 years of age.

Symptoms

You may not have any symptoms of endometrial polyps. If you do have symptoms, they may include:

  • Menstrual bleeding that is not regular or predictable
  • Long or heavy menstrual bleeding
  • Bleeding between periods
  • Bleeding from the vagina after menopause
  • Trouble getting or staying pregnant (infertility)

Exams and Tests

Your health care provider may perform these tests to find out if you have endometrial polyps:

Treatment

Many polyps should be removed because of the small risk for cancer.

Endometrial polyps are most often removed by a procedure called hysteroscopy. Sometimes, a D and C (Dilation and Curettage) can be done to biopsy the endometrium and remove the polyp. This is less commonly used.

Postmenopausal women who have polyps that are not causing symptoms may also consider watchful waiting. However, the polyp should be removed if it is causing vaginal bleeding.

Outlook (Prognosis)

In rare cases, polyps can return after treatment.

Possible Complications

Endometrial polyps may make it hard to get or stay pregnant.

When to Contact a Medical Professional

Call your provider if you have:

  • Menstrual bleeding that is not regular or predictable
  • Long or heavy menstrual bleeding
  • Bleeding between periods
  • Bleeding from the vagina after menopause

Prevention

You cannot prevent endometrial polyps.

Alternative Names

Uterine polyps; Uterine bleeding - polyps; Vaginal bleeding - polyps

References

Bulun SE. Physiology and pathology of the female reproductive axis. In: Melmed S, Polonsky KS, Larsen PR, Kronenberg HM, eds. Williams Textbook of Endocrinology. 13th ed. Philadelphia, PA: Elsevier; 2016:chap 17.

Dolan MS, Hill C, Valea FA. Benign gynecologic lesions: vulva, vagina, cervix, uterus, oviduct, ovary, ultrasound imaging of pelvic structures. In: Lobo RA, Gershenson DM, Lentz GM, Valea FA, eds. Comprehensive Gynecology. 7th ed. Philadelphia, PA: Elsevier; 2017:chap 18.

Goljan EF. Female reproductive disorders and breast disorders. In: Goljan EF, ed. Rapid Review Pathology. 4th ed. Philadelphia, PA: Elsevier Saunders; 2014:chap 22.

Khan Z, Stewart EA. Benign uterine diseases. In: Strauss JF, Barbieri RL, eds. Yen & Jaffe's Reproductive Endocrinology. 7th ed. Philadelphia, PA: Elsevier Saunders; 2014:chap 27.

Review Date 10/4/2016

Updated by: John D. Jacobson, MD, Professor of Obstetrics and Gynecology, Loma Linda University School of Medicine, Loma Linda Center for Fertility, Loma Linda, CA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.