If a girl does not have menstruation by the age of 18, it is called primary amenorrhea. It is recommended to exclude the following reasons for not having menstruation: 1. abnormal development of the uterus causes not having menstruation, such as congenital small uterine development, such as infantile uterus, it is impossible to have menstruation, and it is impossible to get pregnant and have children again in the future. 2. congenital absence of uterus and congenital absence of vagina, for such women, it is also impossible to have menstruation after For such women, it is also impossible to have menstruation again after treatment. If you want to get married, you can only have vaginal surgery, but it can only solve the problem of sexual life, not the problem of menstruation and childbirth. 3. Some diseases can also cause girls not to have menstruation, such as tuberculosis pelvic inflammatory disease, which can lead to destruction of ovarian tissue by Mycobacterium tuberculosis and endometrium by Mycobacterium tuberculosis, which can lead to amenorrhea. It is recommended to give a comprehensive analysis with the clinical history before deciding on a treatment plan.