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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.
Benign, or noncancerous, tumors in the uterus can cause heavy bleeding or long periods. Benign growths in the uterine lining (endometrium) can cause a heavy or prolonged period. These growths are known as polyps, when the growth is made up of endometrial tissue, or fibroids, when the growth is made up of muscle tissue.