“Aunt” generally refers to female menstruation. There are many reasons why teenage girls don’t have menstrual periods, which may be due to physiological factors, such as emotional fluctuations, high stress, etc., or pathological factors, such as polycystic ovary syndrome, hyperprolactinemia and other causes. 1. Physiological factors: Adolescent girls have big mood swings and study pressure, which may affect ovarian function and delay menstruation. 2. Pathologic factors: (1) Polycystic ovary syndrome: it is one of the common gynecological diseases in adolescent and childbearing age women, and the patients usually can have abnormal menstruation, such as irregular cycle, scanty menstruation, low volume, or even amenorrhea, etc., and they can also have acne, obesity and other symptoms. (2) Hyperprolactinemia: If there is a disease such as hyperprolactinemia, it can show symptoms such as amenorrhea and lactation. There are many causes of delayed menstruation in teenage girls, it is recommended to visit the hospital in a timely manner to identify the cause of the disease, and then targeted treatment under the guidance of a professional doctor.