The standardized medical name for functional gynecologic bleeding is abnormal uterine bleeding. Causes include structural changes of the uterus such as endometrial polyps, adenomyosis, fibroids, etc., and no structural changes of the uterus such as systemic coagulopathies, ovulation disorders, use of intrauterine devices or use of emergency contraceptive pills. 1. Uterus with structural changes: mainly including endometrial polyps, adenomyosis, fibroids, endometrial cancer, etc. These diseases will lead to abnormal local coagulation fibers regulating mechanism of the endometrium, and in addition, will also cause abnormal endometrial repair mechanism, so there will be abnormal uterine bleeding. 2. No uterine structural changes: abnormal bleeding will occur if there are systemic coagulation diseases, such as hemophilia, severe hepatic insufficiency, etc. If the patient has ovulation disorder, abnormal uterine bleeding will also occur, which is related to the abnormal hypothalamus-pituitary-ovary function, which will make progesterone secretion insufficient; Abnormal uterine bleeding can also occur if there is an abnormality in the local coagulation mechanism of the endometrium; breakthrough bleeding can also be caused by the use of intrauterine devices or the use of emergency contraceptive pills. Abnormal uterine bleeding has more causes, it is recommended to go to the hospital for detailed examination and symptomatic treatment for the cause.