Menorrhagia (heavy menstrual bleeding)

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Complications

By Mayo Clinic staff

Excessive or prolonged menstrual bleeding can lead to other medical conditions, including:

  • Iron deficiency anemia. In this common type of anemia, your blood is low in hemoglobin, a substance that enables red blood cells to carry oxygen to tissues. Low hemoglobin may be the result of insufficient iron. Menorrhagia may deplete iron levels enough to increase the risk of iron deficiency anemia. Signs and symptoms include pallor, weakness and fatigue.

    Although diet plays a role in iron deficiency anemia, the problem is complicated by heavy menstrual periods. Most cases of anemia are mild, but even mild anemia can cause weakness and fatigue. Moderate to severe anemia can also cause shortness of breath, rapid heart rate, lightheadedness and headaches.

  • Severe pain. Heavy menstrual bleeding often is accompanied by painful menstrual cramps (dysmenorrhea). Sometimes the cramps associated with menorrhagia are severe enough to require prescription medication or a surgical procedure.
References
  1. 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/208746819-4/0/1524/0.html. Accessed May 7, 2011.
  2. Brar MK, et al. Dysfunctional uterine bleeding. In: Ferri FF. Ferri's Clinical Advisor 2011: Instant Diagnosis and Treatment. Philadelphia, Pa.: Mosby Elsevier; 2011. http://www.mdconsult.com/books/about.do?eid=4-u1.0-B978-0-323-05610-6..C2009-0-38600-6--TOP&isbn=978-0-323-05610-6&about=true&uniqId=230100505-53. Accessed May 7, 2011.
  3. Goodman A, et al. Terminology and evaluation of abnormal uterine bleeding in premenopausal women. http://www.uptodate.com/home/index.html. Accessed May 7, 2011.
  4. Zacur HA. Chronic menorrhagia or anovulatory uterine bleeding. http://www.uptodate.com/home/index.html. Accessed May 7, 2011.
  5. Abnormal uterine bleeding. The American Congress of Obstetricians and Gynecologists. http://www.acog.org/publications/patient_education/bp095.cfm. Accessed May 7, 2011.
  6. Menstruation. The American Congress of Obstetricians and Gynecologists. http://www.acog.org/publications/patient_education/bp049.cfm. Accessed May 7, 2011.
  7. The Pap test. The American Congress of Obstetricians and Gynecologists. http://www.acog.org/publications/patient_education/bp085.cfm. Accessed May 7, 2011.
  8. Dysmenorrhea. The Merck Manuals: Home Edition for Patients and Caregivers. http://www.merckmanuals.com/home/au/sec22/ch244/ch244c.html. Accessed May 7, 2011.
  9. Gallenberg MM (expert opinion). Mayo Clinic, Rochester, Minn. May 9, 2011.
DS00394 June 25, 2011

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