Leukorrhea with blood indicates abnormal bleeding from the reproductive system, and the blood may come from the vagina, cervix, uterine cavity, and other parts of the body. The possible causes of leucorrhea with blood in the fifth month of pregnancy include: i. If this symptom occurs after sexual intercourse, it is usually due to contact bleeding caused by cervical polyps or cervical erosive lesions. The amount of bleeding is small and the bleeding lasts for a short period of time, usually appearing within twenty-four hours after sex and disappearing after twenty-four hours. Secondly, if there is no obvious cause for leukorrhea, it is considered that the abnormal bleeding may be caused by the low position of the placenta, especially central placenta praevia or partial placenta praevia. In this case, absolute bed rest and appropriate fetal preservation treatment are usually required, and physical labor, sports and sexual life are absolutely avoided.