In general, women of childbearing age have a menstrual cycle of about 30 days, with a difference of no more than one week before and after. Generally speaking, the amount of menstruation is low on the first day of menstruation, more on the second and third days, and gradually decreases after the fourth day, and can be cleaned naturally in no more than a week. With sanitary napkin calculation, generally no more than one packet of sanitary napkin, it is almost the same. If you have regular menstruation, if the menstrual flow is low, but the cycle is regular, it shows that the ovarian function can still maintain the normal physiological function. Some people are anxious that the low menstrual flow is a sign of ovarian decline. The reason for low menstrual flow may be due to surgical operation of the uterine cavity, resulting in damage to the endometrium, so the menstrual flow will decrease, rather than a sign of ovarian failure. To determine the cause of low menstrual flow, we can use endocrine tests and ultrasound to make a diagnosis. For endocrine examination, we can take blood tests at different times of the menstrual cycle to find out the level of hormones secreted by the ovaries and the changes in the menstrual cycle to determine the function of the ovaries, and for ultrasound examination, we can have a vaginal ultrasound at different times of the menstrual cycle to find out the development of follicles and ovulation, and the growth of the endometrium, and whether the two are growing simultaneously to determine the function of the ovaries. This is to determine the function of the ovaries.