Women with regular menstrual cycles, usually 21-35 days, with periods of 3-7 days, usually without painful periods or clots, and with dark red menstrual blood. If women suffer from cold or physical discomfort during menstruation, it may lead to lower abdominal pain, shortening or lengthening of menstrual period and change in the volume of menstrual blood; in addition, when women suffer from gynecological diseases such as uterine fibroids or dysfunctional bleeding, it may also lead to changes in women’s menstrual cycle. Depending on the cause of the disease, the treatment can be carried out with medication or surgery. In addition, women can increase nutrition during menstruation, pay attention to rest, if there is irregular menstruation, too long or too short periods should promptly consult a doctor to identify the cause.