The reason for this is the following: 1. It may be caused by hormonal disorders and endocrine disorders, which can stimulate the body due to changes in hormone levels, resulting in excessive bleeding from the endometrium. 2. It may be caused by abnormal blood clotting, which is poor during menstruation. If the body resistance is not good or disease reaction, it may lead to abnormal coagulation function, so there will be more than menstruation. 3, there may be disease reaction, such as tumor disease or other gynecological diseases, such as cervical polyps or endometrial polyps and other diseases, may also lead to more than menstruation. It is recommended to go to the hospital in time for examination, you can carry out ultrasound examination, and then to regulate the treatment.