The cycle of normal menstruation is 21-35 days, the period lasts 2-7 days, and the average blood loss is 20-60 ml. Anything that does not meet the above criteria is considered abnormal uterine bleeding, which is one of the most common gynecological problems in women of childbearing age. There are many causes or diseases that cause abnormal uterine bleeding. When patients find abnormal bleeding, they first need to seek timely medical consultation to clarify the cause and then treat it accordingly. Abnormal uterine bleeding in prepubertal women can be caused by precocious puberty, exogenous estrogen, vaginal foreign body, trauma, etc.; abnormal uterine bleeding in puberty can be caused by anovulatory dysfunctional uterine bleeding; abnormal uterine bleeding in women of reproductive age can be caused by dysfunctional uterine bleeding, endometrial polyps, adenomyosis, uterine fibroids, polycystic ovary syndrome, ectopic pregnancy, abortion-related, gestational trophoblastic disease, etc.; abnormal uterine bleeding in peri Abnormal uterine bleeding in perimenopausal women can be seen in dysfunctional uterine bleeding, uterine tumors, atypical endometrial hyperplasia, vaginitis, and malignant tumors of the reproductive tract. In addition, obesity, hypertension, diabetes mellitus, coagulation disorders, multiple pregnancies and deliveries, and abortions can also cause abnormal uterine bleeding. Transient abnormal uterine bleeding may be related to mental stress, malnutrition, sudden environmental and climatic changes, eating disorders, excessive exercise, alcoholism, etc. If the symptoms are relieved after avoiding the above factors, treatment may be temporarily unnecessary. If there is no relief, or if there are other symptoms at the same time, it is necessary to consult a doctor in a timely manner to clarify the cause and treat it accordingly through appropriate examinations, such as ultrasound, pregnancy test, sex hormone level test, coagulation function test, endometrial examination, hysteroscopy, etc. Regardless of the cause of abnormal uterine bleeding, if the bleeding time is long and the bleeding volume is large, anemia or even hemorrhagic shock may occur secondary to abnormal uterine bleeding caused by endocrine diseases, which may lead to infertility, etc. Therefore, when menstrual disorders or irregular uterine bleeding are found, the first thing you need to do is to seek medical attention promptly.