Low back pain at 36 weeks of pregnancy is a common clinical manifestation. If the symptoms of low back pain simply appear, it is not necessarily a symptom before delivery, but also needs to be judged comprehensively according to whether there are other accompanying symptoms. The symptoms of lumbago in late pregnancy may be caused by a variety of reasons, and the more common ones are as follows: 1. Fetal development: As the fetus continues to develop, the uterus will gradually increase in size, the abdomen will expand forward, the center of gravity will shift forward when standing, and in order to maintain the balance of the body, the pregnant woman’s body will lean backward and the center of gravity will shift to the top of the hips, and the weight of the pregnant woman’s upper body will be borne by the lumbar spine and the muscles of the lumbar region, resulting in The performance of lumbar pain; 2, hormonal influence: after pregnancy, in order to ensure that the fetus can pass through the birth canal smoothly, the pregnant woman’s body will secrete hormones to make the ligaments and muscles connecting the pelvis gradually relax, the curvature of the spine becomes larger, and the pressure of the uterus on the nerves in the lumbar back increases, causing lumbar pain; 3, physical strength decline: insufficient exercise during pregnancy, physical strength decreases, and the pregnant woman is prone to lumbar pain after activity; 4, preterm labor: if The appearance of lumbago symptoms persistently cannot be relieved, and accompanied by regular uterine contractions, redness or rupture of amniotic fluid and other symptoms, it may be a manifestation of preterm labor, which needs to be treated at the hospital in time. Therefore, the symptoms of lumbago in late pregnancy can be relieved by taking proper rest or applying a lap belt, but if it is accompanied by abnormalities, you need to seek medical attention in time.