The incidence of dysfunctional uterine bleeding

The exact incidence of dysfunctional uterine bleeding is still unclear. According to literature reports, the incidence of functional uterine bleeding accounts for about 10% of gynecological outpatients. According to the pathogenesis, it can be divided into two categories: anovulatory and ovulatory, of which about 85% of cases are anovulatory functional uterine bleeding. Dysfunctional uterine bleeding can occur at any age from menarche to menopause. 50% of patients occur during the menopausal transition period, 30% during childbearing age, and 20% during adolescence. A survey of 3,000 female middle school students aged 14 to 18 in Turkey found that 62.5% of girls had experienced abnormal uterine bleeding at least once, and 26.7% had irregular menstrual cycles .

There is data on the investigation of 60 cases of dysfunctional uterine bleeding in college students. The results show that 20 cases had excessive menstrual flow, exceeding 80ml, or even exceeding 150ml, with regular menstrual cycles or prolonged menstruation for more than 7 days. 20 cases had irregular menstrual cycles, long menstrual periods but little menstrual flow, and each menstrual flow did not exceed 80ml. 15 cases had menstrual cycles shorter than 21 days, or even menstruation once every half month, with menstrual flow not exceeding 80ml. 5 cases had irregular cycles, ranging from 20 to 90 days, with excessive menstrual flow, and 2 of them had hemorrhagic shock. 25 of the 60 cases had secondary anemia of varying degrees. The characteristics of adolescent functional uterine bleeding in college students can be summarized as follows: most of them are anovulatory functional uterine bleeding; the cause is the immature feedback regulation mechanism between the hormones of the hypothalamus-pituitary-ovarian axis; the symptoms are irregular uterine bleeding, that is, menstrual cycle disorder, varying menstrual length, and bleeding volume that is more or less; the obvious inducement is study tension, overwork, environmental and climate changes; often accompanied by secondary anemia.