The vast majority of women have the most menstrual flow on the second day of menstruation. If the flow is high on the first day of menstruation, the subsequent flow will gradually decrease, possibly because the endometrium is shed extensively on the first day, so it is clinically manifested as more menstrual flow on the first day. Subsequently, on the second and third day, the amount of menstruation gradually decreases until the menstruation clears. It is recommended that you must pay attention to keeping warm when you have your period, and you should pay attention not to take blood-boosting drugs or drink alcohol when you have your period, so as not to cause more menstrual flow and lead to temporary symptoms of anemia. In addition, if the first day of menstruation is heavy and the subsequent days of menstruation are also heavy, it is recommended to rule out the possibility of fibroids and the possibility of endometrial inflammation and endometrial polyps, as these diseases may lead to increased menstrual flow.