I believe that girls have experienced the pain of their great aunt just like Xiaobian. So why do women come back to their aunts? When girls reach their puberty, there will be 3-5 days of vaginal bleeding every 28-30 days. The amount of blood is about 50 ml, which is very regular. This is menstruation.
Why do girls come to my aunt? What benefit does woman come menstruation have to the body?
In short, menstruation is a "battle of cultivation" of endometrium under the control of sex hormones. A few days before the ovaries produce eggs every month, the pituitary gland will secrete a large amount of FSH, and the ovaries will produce more estrogen, which will make the endometrium thicken, blood vessels increase and gland secretion increase, just like soil loosening and fertilization.
If a fertilized egg comes and grows in this fertile 'soil', it is pregnancy. As a result, the endometrium does not need to be cultivated, and menstruation stops. On the contrary, if there is no pregnancy, endometrial cells will fall off, blood vessels shrivel, become menstrual outflow. But after a short time, the uterus has to prepare for the birth of eggs in the next month.