Aunt refers to menstruation, and the common precursors of menstruation for girls include breast tenderness, abdominal distension, increase in vaginal discharge, decrease in body temperature and weight gain, etc. The most common precursors of menstruation for girls include breast tenderness, abdominal distension, increase in vaginal discharge, decrease in body temperature and weight gain. 1. Breast swelling and pain: before a girl’s menstruation due to the increase in estrogen and progesterone in the body, which can promote the development of breast ducts and follicles, will appear before the menstruation of swelling and pain, usually after the menstruation will be reduced or disappeared. 2. Abdominal distension: before the girl’s menstruation due to the pelvic cavity is in a state of congestion, the body of prostaglandins can cause uterine contraction, both of which can be before the menstruation symptoms of abdominal pain. 3. Increase in vaginal secretion: before the girl’s menstruation, the secretion of endometrial glands will increase, so it leads to an increase in leukorrhea, this leukorrhea belongs to the physiological leukorrhea, and does not require special treatment, but need to pay more attention to hygiene, to prevent infection. 4. Decrease in body temperature and weight gain: Because the basal body temperature of girls before menstruation will decline with the change of hormone levels in the body, generally down 0.3 to 0.5 ℃. In addition, before the girl’s menstruation also due to the role of estrogen and progesterone in the body, will cause the body of water and sodium retention, and menstruation before the pelvic cavity is in a state of congestion and edema, so there will be the phenomenon of weight gain. If there is an abnormal performance before the girl’s menstruation, you need to go to the hospital in time to check and follow the doctor’s instructions to deal with the treatment, so as not to delay the condition.