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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.
There are several medical conditions that can cause prolonged, heavy bleeding. They include: 1  Dysfunctional Uterine Bleeding (DUB) â A common cause of long periods is a condition called dysfunctional uterine bleeding. 2  DUB is caused by a hormonal imbalance. 3  This period problem can cause you to spot between periods, have heavy menstrual bleeding, and have long periods.