Non-menstrual bleeding that is bright red and painless may be ovulatory bleeding, or it may be related to cervicitis, cervical polyps, endometrial polyps, submucosal fibroids, etc. or other factors. 1. Ovulation bleeding: Ovulation occurs between two menstrual periods, that is, about 14~15 days before the next menstrual period. At the time of ovulation, the fluctuation of hormone levels will lead to a small amount of vaginal bleeding, which lasts about 2~3 days and most of them will be cleaned up within a week. 2. Cervicitis: Chlamydia trachomatis infection, Neisseria gonorrhoeae infection and other infections lead to cervical mucosal congestion, edema and bleeding. Cervicitis can be intermenstrual bleeding, contact bleeding and other symptoms, bleeding bright red, no pain. 3. Cervical polyps: local hyperplasia of the interstitium or glands of the cervical canal under chronic inflammatory stimulation, forming cervical polyps, causing increased vaginal discharge, bleeding between periods, contact bleeding and other symptoms, bright red color, no pain. 4. Endometrial polyps: high estrogen level in female body, chronic endometritis stimulation, foreign body stimulation in the uterine cavity can cause endometrial polyps, endometrial polyps can cause bleeding between menstruation, color red, no lower abdominal pain. 5. Submucosal fibroids: fibroids are located in the uterine cavity and grow into the uterine cavity as submucosal fibroids. Submucosal fibroids can cause irregular vaginal bleeding, red color, no lower abdominal pain and other symptoms. 6. Other factors: such as taking certain drugs, wearing intrauterine devices or blood diseases can lead to non-menstrual bleeding. Therefore, when this situation occurs, it is recommended to go to the hospital in time for examination, to clarify the cause of the disease and then follow the doctor’s instructions to deal with the treatment.