Females at the age of 17 in puberty have an imperfectly developed gonadal axis and experience abnormal menstrual cycles, often without ovulation due to dysfunctional uterine bleeding. In addition, adolescent females have more mood swings, and their physiological and psychological development is not perfect. They are easily affected by external or internal influences, such as weather changes, changes in the living environment, stressful studies, and minor conflicts between friends, all of which can cause emotional and psychological changes, which can lead to dysfunctional uterine bleeding. The presence of abnormal thyroid function and adrenal function in young girls can lead to menstrual cycle disorders; accompanied by metabolic diseases, such as abnormal blood sugar and elevated blood sugar levels, can also cause irregular menstrual cycles. In these cases, pelvic ultrasonography should be performed first to exclude menstrual irregularities caused by organic lesions of the reproductive system, such as uterine fibroids, and only afterwards can we consider whether it is dysfunctional uterine bleeding.