Menarche, noun. Also known as Tiangui Water, Shou Jing, Tiangui Water, etc. It refers to a woman’s first menstrual period and represents the changes a girl’s body undergoes during puberty, which usually occurs two years after breasts begin to develop.

The first menstrual period for a girl is one of the important signs of puberty.

Menarche means that the endometrium is stimulated by estrogen to develop, and it also means that the passage from the uterus to the cervix to the vagina is opened.

Menarche indicates that the ovaries have begun to function. Thousands of follicles in the ovarian cortex have gradually begun to mature, and the body's endocrine system has also begun to function. In the hypothalamus-pituitary gland, Under control, the ovaries can secrete estrogen, which affects the endometrium.