In general, redness at 36 weeks of pregnancy may be preterm labor. Usually, 1-2 days before labor starts, the fetal membranes near the inner cervical opening and the uterine wall will gradually separate and the capillaries will rupture, causing a small amount of bleeding, which, after mixing with the mucus in the cervical canal, will appear as a faint bloody mucus and will be discharged through the vagina, which is called redness. In this case, the pregnant woman should be admitted to the hospital in time for ultrasound and fetal heart monitoring, and it is usually recommended to keep the fetus until full term. If the vaginal bleeding gradually increases, the blood is bright red and the amount of blood reaches or even exceeds the amount of menstruation, it should be considered as pathological prenatal bleeding, the most common causes include placenta praevia and placental abruption. The most common causes include placenta praevia and placenta abruptio. The placenta covers the inner cervix or the placenta abrupts the uterine wall, causing the pregnant woman to bleed vaginally, which results in red bleeding symptoms. It is recommended that the pregnant woman should be examined in time and undergo appropriate fetal preservation treatment. If fetal preservation is unsuccessful, a cesarean section is needed to avoid endangering the life of the mother and child. In addition, redness at 36 weeks of pregnancy may also be cervical lesions, such as cervical submucosal fibroids, cervical polyps, cervical precancerous lesions, etc. Although the possibility is not very high, we should also pay attention to the identification.