Whether or not back pain in almost five months of pregnancy will cause bleeding depends on the cause of the back pain. If the back pain is caused by preeclampsia, placenta previa, etc., bleeding may occur, and if it is caused by back pain due to back diseases, it usually will not cause bleeding. When a pregnant woman in her 5th month of pregnancy has an aura of miscarriage due to exertion, external trauma, fetal abnormality, etc., and when there is placental abruption due to trauma, etc., the pregnant woman may experience vaginal bleeding, abdominal pain, and other symptoms, which may be accompanied by low back pain and discomfort. Bleeding occurs due to fetal injury. If the pain is caused by the increased size of the fetus after pregnancy, which results in a greater load on the lower back muscles of the pregnant woman, or if the pregnant woman herself has a lumbar spine disease, she will experience low back pain. This condition usually does not cause fetal damage and vaginal bleeding rarely occurs. Pregnant women who experience low back pain, if accompanied by bleeding, need to seek timely medical examination and treatment under the guidance of a doctor.