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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.
1 Fibroids â These non-cancerous muscular growths on the uterus can cause you to have heavy menstrual bleeding and long periods. 2  Submucosal fibroids, which are found in your uterine cavity, cause prolonged, heavy periods. 3  Fibroids are very common in women of reproductive age, since estrogen fuels their growth.