Late pregnancy secretions with blood may be caused by preterm labor, cervical polyps, redness and so on. 1. preterm labor: in late pregnancy <37 weeks of vaginal discharge with blood may be caused by preterm labor, can also be accompanied by lower abdominal pain, combined with ultrasound, cervical canal length measurement and gynecological examination can assist in the diagnosis, need to comply with the doctor’s instructions to protect the fetus. 2. Cervical polyp: it can also cause the symptom of blood in vaginal discharge, which is not accompanied by abdominal pain and may recur, and can be diagnosed by gynecological examination and ultrasonography. 3. Redness: a small amount of vaginal bleeding that occurs within 24-48 hours before labor starts, which may be manifested as blood in the discharge, and may be accompanied by irregular lower abdominal pain and a sense of descent of the baby’s first dew, which can be diagnosed by combining with the medical history and clinical manifestations. If the discharge is bloody in late pregnancy, you can go to the hospital to find out the cause and deal with it actively.