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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 If you're going through puberty, your periods may be heavy while your hormonal levels adjust; an imbalance in estrogen and progesterone can cause heavy periods. 2  If you've just stopped taking the Pill, you might have a heavier period, since the Pill tends to make periods lighter.