Low amount on the first day of menstruation is a normal phenomenon, mainly due to the first day of menstruation, the uterine lining is not completely shed, the relative amount of menstrual flow is relatively small, on the second or third day of menstruation, menstrual blood will increase. On the second or third day of menstruation, the amount of menstrual blood will increase. If the first day of menstrual blood is less, you can apply local hot compresses and drink ginger and brown sugar water in moderation, and then observe the outflow of menstrual blood, if the amount of menstrual blood throughout the entire menstrual cycle is significantly reduced, we should consider the possibility of menstrual disorders. It can be regulated by regular life, paying attention to rest and avoiding overwork, maintaining emotional stability and paying attention to keeping warm and avoiding cold. If the amount of menstruation is abnormal for several consecutive cycles, we should consider the possibility of endocrine disorders, and we need to go to the obstetrics and gynecology department of the hospital, and further pass the ultrasound of uterus, as well as the hormone six tests, to clarify the specific causes, and then target treatment.