There are more reasons for irregular menstrual bleeding, and the main ones are as follows: 1. Ovulation disorder: If there are patients with polycystic ovary syndrome, they will have irregular menstrual bleeding, and some of them may have more or less bleeding at times, drenching, or have no cycle regularity. This part of the people need to do menstrual hormone six tests, ultrasound, and then combined with physical examination, medical history, etc. to give their diagnosis, polycystic ovary syndrome is very easy to treat, treatment of this irregular bleeding, as long as there is no endometrial lesions, to give the short-acting contraceptive pills can be; 2, endometrial polyps or submucosal uterine fibroids: polypoidal uterine fibroids can also occur in the patients, the gold standard of diagnosis is after the menstrual period is clean or during bleeding. The gold standard of diagnosis is after the menstrual period is clean, or during the bleeding period can be given a hysteroscopic examination, hysteroscopy. After diagnosis, it is necessary to do electrosurgery to cut off the polyps or submucosal fibroids and remove the cause of the disease, then the disease will be cured; 3. Cancer: such as endometrial cancer, pre-cancerous lesions, hyperplasia of the uterine lining, endometrial hyperplasia can be divided into endometrial hyperplasia accompanied by atypical hyperplasia and endometrial hyperplasia not accompanied by atypical hyperplasia. To confirm the diagnosis, it is necessary to do hysteroscopy and take a biopsy at a fixed point. When abnormal endometrium is found under the microscope, biopsy is taken, diagnostic scraping is done, and the endometrium is sent to pathology for examination, whether there is atypical hyperplasia or no atypical hyperplasia, and as long as it is a hyperplasia of the endometrium such as simple or complex endometrial hyperplasia, it is necessary to carry out drug treatment. If cancer cells, i.e. endometrial cancer, are found, surgical treatment is often needed; 4. Drugs: such as using warfarin and other drugs will cause changes in coagulation; 5. Systemic diseases: such as thrombocytopenic purpura, hemophilia, etc., this kind of problem in coagulation mechanism will also cause irregular bleeding from the uterus, no matter the amount is large or small, as long as irregular bleeding from the uterus occurs, you should go to the hospital for checkup; 6, Lesions of cervix: such as cervical cancer, a more prominent feature of this disease is bleeding after coitus, which will find that the cervix has cumbersome organisms or shows erosion. In the case of cervical lesions, the surgery is simpler, while in the case of cervical cancer, the surgery is more traumatic. Therefore, women who are sexually active should undergo regular health checkups, including cervical lesion checkups and gynecological checkups are essential.