Normal women’s menstrual flow is 20-60ml, due to each person’s different physical quality, nutrition, and heredity, so the amount of menstrual flow can be more or less, medical science to use how many sanitary napkins to judge the amount of menstrual flow. Under normal circumstances, 10-20 sanitary napkins are within the normal range. If the amount of menstrual flow is less than 10 sanitary napkins at a time, or even as long as you use pads, it means that the amount of menstrual flow is relatively low. If you have a lot of menstrual flow with large blood clots when you have your period, and using 20 sanitary napkins is not enough, it means that you have too much menstrual flow. Too little or too much menstruation is a sign of abnormality and it is best to see a doctor at the hospital.