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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 Polyps. 2  Small, benign growths on the lining of the uterus (uterine polyps) may cause heavy or prolonged menstrual bleeding. 3  Polyps of the uterus most commonly occur in women of reproductive age as the result of high hormone levels.