Regular vacation is known as menstruation. There are many reasons why the patient’s menstrual flow is particularly low, which may be due to ovarian hypoplasia, pregnancy, hormone level disorders in the body, uterine cavity adhesion, etc. The patient should consult a doctor for a clear diagnosis in a timely manner, and be treated under the doctor’s guidance. 1. Ovarian hypoplasia: may be due to age, stress and other reasons, patients often have short menstrual cycles, low menstrual flow and other symptoms, patients should consult a doctor for examination. If it is due to age factor, then patients do not need to worry too much, this is a normal physiological situation. If the patient is due to stress, the patient should reduce the pressure, improve the state of life, the patient can also use estradiol valerate tablets, combined with estrogen tablets and other drugs under the guidance of the doctor for treatment. 2. Pregnancy: If the patient’s menstrual flow is normal, but suddenly has a low menstrual flow, the patient should be alert to the possibility of pregnancy. 3. Hormone level disorders: in adolescent women, due to the imperfect development of hypothalamus-pituitary-ovary function, patients often have low menstrual flow, which does not need to be treated, and with the continuous development of the nervous system, the symptoms will gradually disappear. 4. Uterine adhesion: due to abortion, scraping, endometritis, etc., the endometrium basal layer is damaged, and the uterine cavity is partially or completely blocked, resulting in decreased menstrual flow and shortened menstrual period. There may also be other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.