The most common reasons for having blood in the leucorrhea after menstruation are as follows: 1. Because of insufficient estrogen, the endometrium is not fully repaired, so there is blood in the leucorrhea, which often does not cause symptoms such as pain in the lower abdomen. 2. Caused by chronic inflammation of the cervix, when there is chronic inflammation of the cervix locally, the tissue is more brittle, so there is a rupture of capillaries, which 3, inflammation of the endometrium, pelvic inflammatory disease, endometriosis, pelvic tumor may appear after the clean menstruation leucorrhea with blood. The following tests are recommended: 1. gynecological examination to find out whether there are local abnormalities in the cervix and to do cervical cancer screening if necessary. 2. double examination to find out whether there is pressure pain in the uterine adnexa and to exclude the possibility of pelvic tumor or pelvic inflammation. 3. ultrasound examination to find out the situation in the endometrium and pelvis, and then give treatment according to the examination results.