The following are possible causes of menstrual discharges: 1) the uterus may be cold and the flow of menstrual blood may be poor; 2) the cervical opening may be too tight; 3) the angle between the cervix and the uterine body is too large when the uterus is excessively flexed forward or backward, which is not conducive to the discharge of menstrual flow; 4) the uterine cavity may be seriously deformed when a woman has fibroids, which may also lead to poor discharge of menstrual blood. When women occasionally have poor menstrual discharge, they can pay attention to proper warmth, eat more hot food or take oral motherwort pellets to promote smooth discharge during menstruation. If women often have irregular menstrual bleeding, it is better to go to the hospital for gynecological ultrasound and gynecological examination, and take corresponding symptomatic treatment measures according to different causes, which is more effective.