The possible reasons for having blood again 10 days after the end of menstruation include the following: 1. If the amount of bleeding is relatively small, lasts for a relatively short period of time, can be cleaned on its own within 3-5 days, and occurs several times in a row, in the middle of two menstrual cycles, it is considered to be ovulatory bleeding, which is a physiological phenomenon. 2. If the amount of bleeding is large, not greatly different from the usual menstrual period, and the bleeding time If the bleeding is not regular, the amount of bleeding is not much, the duration is long, and the bleeding is incomplete, the patient is considered to have endometrial polyps, cervical polyps, submucosal fibroids, and other organic gynecological diseases that cause abnormal bleeding.