The following factors are considered: 1. Psychological factors, nowadays, women are under pressure from various aspects, and their spirit is always in a high state of tension, which affects the endocrine function for a long time, resulting in a short period. 2. Abnormalities of the central nervous hypothalamus, anorexia nervosa, weight loss, excessive exercise, and drug stimulation can affect the hypothalamus; certain congenital diseases, malformations of female brain development, brain tumors, etc. can also cause abnormal hormone secretion. 3. 3, dysfunctional uterine bleeding, in adolescent women, the appearance of short periods is related to the immature development of the gonadal axis. 4, luteal insufficiency. 5, gynecological diseases, severe uterine fibroids, while changing the volume of menstruation, but also excessive menstruation, frequent menstruation and short menstrual periods.