There are many reasons for women to have heavy menstruation, which can be divided into the following points: 1. When female patients have endocrine disorders, it will lead to heavy menstruation. 2, Heavy menstruation may also occur due to organic lesions, such as inflammation of the genitals or the presence of tumors, abnormal adrenal cortical function and diabetes. In addition to the above three causes of heavy menstruation, long-term use of intrauterine devices or long-term use of hormonal drugs can also cause heavy menstruation.