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  • With Mayo Clinic gynecologist and obstetrician

    Mary Gallenberg, M.D.

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Mayo Clinic Health Manager

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Question

Hormone replacement therapy: Can it cause vaginal bleeding?

I'm taking hormone therapy for menopause symptoms. Recently, I've been experiencing heavy vaginal bleeding with clots. This occurs on a regular monthly basis — similar to a menstrual period. Should I be concerned?

Answer

from Mary Gallenberg, M.D.

Some forms of hormone therapy for menopause may cause monthly bleeding. This includes cyclic hormone therapy preparations that contain a combination of estrogen and a progestin. The progestin is used to prevent endometrial cancer if you have an intact uterus.

Hormone therapy can result in bleeding that may be light or may be as heavy as a normal period. If you have concerns about your bleeding and think it might be heavier than normal, you should see your doctor or health care provider.

Potential causes of abnormal bleeding during or after menopause include:

  • Shrinking or thinning of tissue lining the vagina and uterus due to a decrease in estrogen
  • Uterine polyps or fibroids
  • Infections of the uterus, such as endometritis and cervicitis
  • Abnormal growth of the lining of the uterus (endometrial hyperplasia)
  • Endometrial cancer

In addition to a careful history and physical examination, laboratory tests and diagnostic procedures may be used to identify the cause of abnormal bleeding in menopausal women.

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References
  1. Bulun SE, et al. The physiology and pathology of the female reproductive axis. In: Kronenberg HM, et al. Williams Textbook of Endocrinology. 11th ed. Philadelphia, Pa.: Saunders Elsevier; 2008. http://www.mdconsult.com/das/book/body/159855291-3/0/1555/100.html?tocnode=54107136&fromURL=100.html#4-u1.0-B978-1-4160-2911-3..50018-2_1399. Accessed Sept. 14, 2009.
  2. Mohan S, et al. Diagnosis of abnormal uterine bleeding. Best Practice & Research Clinical Obstetrics and Gynecology. 2007;21:891.
  3. Lobo RA. Abnormal uterine bleeding: Ovulatory and anovulatory dysfunctional uterine bleeding, management of acute and chronic excessive bleeding. In: Katz VL, et al. Comprehensive Gynecology. 5th ed. Philadelphia, Pa.: Mosby Elsevier; 2007. http://www.mdconsult.com/das/book/body/159855291-4/0/1524/248.html?tocnode=53759912&fromURL=248.html#4-u1.0-B978-0-323-02951-3..50040-6_1192. Accessed Sept. 14, 2009.

AN01208

Oct. 16, 2009

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