Dysfunctional uterine bleeding is clinically divided into ovulatory and anovulatory functional uterine bleeding.

Dysfunctional uterine bleeding is common in adolescence when the ovaries begin to mature and in menopause when the ovaries begin to decline. During adolescence, due to the maturation disorder of the hypothalamic cycle center, the mid-term LH peak like normal menstruation cannot be caused, and the follicles cannot ovulate, so it is often anovulatory functional uterine bleeding. It is also often anovulatory functional uterine bleeding during menopause. Dysfunctional uterine bleeding is relatively rare in people of childbearing age. It can be seen after miscarriage or childbirth. In addition to anovulatory functional uterine bleeding, ovulatory functional uterine bleeding can also occur, that is, the ovaries are less disturbed, and although ovulation occurs, the corpus luteum is not fully developed or atrophied and delayed due to the relatively insufficient or persistent secretion of LH after ovulation.

1. Anovulatory functional uterine bleeding: The most common clinical symptom is irregular uterine bleeding, characterized by irregular menstrual cycles, varying lengths of menstrual periods, varying amounts of bleeding, and even heavy bleeding. Sometimes there is a short period of amenorrhea followed by uterine bleeding. Sometimes it manifests as irregular bleeding at first. Sometimes the cycle is regular, with only increased menstrual blood volume and prolonged menstrual periods. There is no lower abdominal pain or other discomfort during the bleeding period, and those with heavy bleeding may develop anemia.

2. Ovulatory dysfunctional uterine bleeding: 1) Imperfect corpus luteum development: Clinically, it is often manifested as a shortened menstrual cycle, less than 28 days. Some patients have normal menstrual periods, often accompanied by infertility or early miscarriage. 2) Incomplete corpus luteum atrophy: caused by insufficient secretion of estrogen and progesterone. It often occurs in women of childbearing age, with normal menstrual cycles but prolonged menstruation, varying amounts of bleeding, and sometimes continuous bleeding before and after menstruation, mainly manifested as prolonged menstruation.