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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.
Periods typically occur every 4 weeks and last no more than 7 days. Sometimes, periods become especially heavy and last an unusually long time. Several things can cause heavy or prolonged menstrual bleeding, called menorrhagia.Possibilities include reproductive system problems and disorders unrelated to reproductive function.ne or more noncancerous growths called uterine fibroids, or leiomyomas, are a common cause of heavy flow. These growths develop in the uterine wall and contain muscle and other tissue. Other noncancerous growths, called polyps, can develop on the surface of the uterine lining and also cause heavy, long periods.