It is normal for a woman to have a period of 3-7 days. Most women have a period of about 5 days, and it is normal for a woman to have a period of 3-7 days. If a patient’s period exceeds the range of 3-7 days, it is an abnormal phenomenon and clinically belongs to the category of menstrual disorders, which should be promptly identified and regulated. There are many factors that can cause menstrual disorders in women. If a woman has weak qi and blood, cold and blood stasis or poor nutrition, she may have short periods. If a woman has fibroids or decreased blood clotting function, she may have prolonged periods. No matter short or prolonged periods, she should go to the hospital for ultrasound and sex hormone test, and then take medicine for treatment under the guidance of the doctor.