Vaginal bleeding after 2 days of complete menstruation is often caused by the following clinical reasons: First, endocrine disorders, when estrogen is insufficient, the endometrium has been repaired, due to the lack of estrogen, it is likely to cause vaginal bleeding again. Second, the endometrium of the inflammation caused by the endometrium, due to the inflammation of the endometrium caused by the tissue is relatively brittle, will make the endometrium irregular shedding, vaginal bleeding. Certain diseases, such as endometriosis or submucosal fibroids, may cause irregular vaginal bleeding. Fourth, in the clinic, if it is coagulation dysfunction, thrombocytopenia and other medical diseases caused by blood problems, can also lead to irregular vaginal bleeding. Therefore, clinically, ultrasound examination, routine blood test, and if necessary, blood test for sex hormone six, to know whether the endocrine is normal or not.