No ovulation, but bleeding, refers to anovulatory uterine bleeding, mostly due to the body’s estrogen and progesterone secretion disorders, resulting in irregular ovulation, unable to maintain the uterine lining, resulting in irregular shedding of the uterine lining, most often seen in puberty, menopause and stress or mental trauma of the female and so on. 1. Puberty: Menstruation is controlled by the hypothalamic-pituitary-ovarian axis. During puberty, the immature or delayed development of the hypothalamic-pituitary-ovarian axis may lead to disorders in the secretion of estrogen and progesterone, which cannot maintain the endometrium, resulting in the irregular shedding of the endometrium and the appearance of hemorrhage. 2. Menopause: During menopause, women may experience irregular bleeding from the uterus due to the lack of follicles caused by ovarian hypoplasia and reduced sensitivity to gonadotropins. 3. Stress or mental trauma: some women have excessive stress, seasonal changes, stress reactions, etc., may also affect the hypothalamus-pituitary-ovarian axis, which leads to disorders in the secretion of estrogen and progesterone, resulting in the irregular shedding of the uterine lining, which manifests itself as anovulatory uterine bleeding. After the occurrence of anovulatory uterine bleeding, it is recommended to consult a doctor in a timely manner and formulate a reasonable treatment plan after the doctor’s interview and relevant examinations.