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Causes of Menorrhagia. There are many possible causes of heavy menstrual bleeding. They include: 1  Hormonal imbalance, particularly in estrogen and progesterone; this is most common in adolescents who recently began their periods and women who are getting close to menopause.
A: Often, the underlying cause of excessively heavy periods is not known. Many women experience heavy flow when the body's healthy blood clotting process doesn't function properly. The breakdown of blood clots occurs more rapidly than normal, causing excessive bleeding during menstruation.