15-year-old children menstruation once every half a month, may be due to the immaturity of ovarian development, endocrine disorders, etc., may also be a coagulation dysfunction, etc., it is recommended to consult a doctor to clarify the condition, you can follow the doctor’s instructions for temporary observation, or the use of oestradiol valerate tablets, dydrogesterone tablets and other estrogenic hormones such as drugs to adjust the menstrual cycle, do not deal with their own blindly, so as to avoid delaying or exacerbating the condition. 1. Ovarian immaturity: the ovaries begin to develop during puberty, but the gonadal axis is still immature, hormone secretion disorders, functional abnormal uterine bleeding will occur, usually after the first menstruation, it takes a few months or a few years to build up a regular menstrual cycle, after consulting a doctor to exclude organic diseases, you can temporarily observe or follow the doctor’s advice to use estradiol valerate tablets, dydrogestrel tablets and other estrogenic hormones to adjust the menstrual cycle. 2. Endocrine disorders: If the menstrual cycle is abnormal after regular menstruation, it may also be caused by long-term use of contraceptives, stress, anxiety, fatigue and other causes of endocrine disorders in girls, the need for regular rest and relaxation, relieve stress, appropriate activities, and if necessary, follow the doctor’s advice to use dydrogesterone tablets, drospirenone ethinyl estradiol tablets, and other estrogenic hormone medications to adjust the menstrual cycle. The 15-year-old child menstruation half a month may also exist coagulation dysfunction and many other reasons, it is recommended to consult a doctor in a timely manner to clarify the condition, follow the doctor’s instructions for targeted treatment.