Before the first menstrual period, women usually have signs such as significant growth in height, breast development, growth of pubic hair and other secondary sexual characteristics, increased leukorrhea, lower abdominal distension and other signs. The first menstrual period is also known as the first menstruation, at this time women are in the stage of puberty, women will be due to changes in the levels of estrogen, androgen and other changes in the body and the following signs: 1. Significant height growth: After entering puberty, women will grow taller within a short period of time due to the increase in androgen levels in the body. 2. The emergence of secondary sexual characteristics: under the action of estrogen, women will lead to the proliferation and development of the lumen of the milk ducts, more and more fatty tissues in the breasts, so that the breasts are gradually plumped up; under the action of androgens, it will make the pubic hair, armpit hair, etc., gradually dense and thickened. 3. Increased leukorrhea, lower abdominal distension and pain: due to the role of estrogen in the body, will lead to cervical, vaginal mucosa secretion increases, so women will appear more egg-white leukorrhea; at the same time, due to the pelvic tissues of congestion and edema will appear in the lower abdomen distension and pain and other discomforts.