There are many reasons why women experience vaginal bleeding during non-menstrual periods, the most common ones are as follows: 1. Bleeding caused by local inflammation of the vagina or local inflammation of the cervix, often vaginal polyps or cervical polyps. 2. caused by local changes in the cervix, such as chronic inflammation of the cervix or due to cervical cancer. 3. vaginal bleeding caused by endocrine disorders, such as The symptoms of vaginal bleeding may be caused by estrogen deficiency, progesterone deficiency or other hormone level variation.4. Endometrial inflammation, submucosal fibroids and endometrial polyps may occur.5. Pelvic tumors or endometriosis may manifest clinically as irregular vaginal bleeding, and it is recommended to have an examination and then to treat according to the examination results.