Why does aunt always come early?

Menstruation is always ahead of schedule and ovarian function has a relationship, because the regulation of menstrual cycle and ovarian secretion of hormones is relatively large, such as estrogen and progesterone levels, especially after ovulation, ovarian corpus luteum, will secrete progesterone. When the amount of progesterone secretion decreases, it will show menstrual cramps ahead of schedule, but also need to be determined according to the time ahead. If the advance time is within 7 days, this is a reasonable range, no special treatment, but if the advance time is relatively early, such as about 10 days, this is not normal. Usually, you need to go through drugs to treat and restore regular menstrual cycles.