The menstrual volume is normally 50-80 ml at a time. A significant increase is probably due to the following possibilities: 1. Functional uterine bleeding, which occurs more often during puberty or menopause and requires estrogen and progesterone therapy. 2. After placement of an intrauterine device, an increase in menstrual volume can occur because the endometrium is stimulated by the device and the uterus contracts abnormally, which will improve with prolonged placement. 3. 4. Larger intermural fibroids or subplasmic fibroids can also cause a significant increase in menstrual flow. 5. Blood system disorders, such as hemophilia, thrombocytopenia, and moderate or higher anemia can also cause a significant increase in menstrual flow. For different causes of heavy menstrual flow, a clear diagnosis and targeted treatment is needed, with some requiring medication and some requiring surgery.