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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.
Other conditions that can cause heavy menstrual bleeding include: Anovulation, or the ovaries' failure to produce or release mature eggs; Polyps on the endometrium, the inner lining of the uterus; Endometrial cancer; Endometrial hyperplasia, or a thickening of the uterine lining; Abnormal thyroid or pituitary gland function