The normal amount of menstrual bleeding should be 20 to 60 ml, and less than 20 ml is considered menstrual hypomenorrhea. The normal amount of sanitary napkins is about four or five times a day, and not less than 1 packet per cycle (10 pieces per packet). If you can’t even use half a packet of sanitary napkins, then you are having a low menstrual flow. Low menstrual flow is a menstrual disease, which can progress to amenorrhea if it occurs during puberty and childbearing years, and often into menopause if it occurs during menopause. Low menstrual flow means decreased estrogen and reduced ovarian function. In many women with premature ovarian failure, the first manifestations of the disease are menstrual disorders, delayed menstrual cycles, low menstrual flow, sporadic menstruation, and gradually shortened periods, followed by amenorrhea. This leads to early menopause. The continuous decrease in menstrual flow mostly means that the female estrogen level changes and decreases and the ovarian function decreases.