It is normal to experience low back pain in the late hospital stage. In the later stages of pregnancy, as the fetus grows, the uterus enlarges and the belly bulges towards the front, which will lead to the center of gravity in the lumbar spine, which will show pulling-like pain and manifest the phenomenon of back pain and back pain. Pay attention to rest in the second trimester and do not stand or sit for long periods of time to avoid poor blood circulation, which can lead to increased symptoms of low back pain. It is also necessary to pay attention to keep warm during the second trimester to avoid getting cold, which can also lead to back pain after being stimulated by cold. You should also pay attention to calcium supplementation in the second trimester, because insufficient calcium supplementation during fetal growth can lead to osteoporosis, causing muscle pain in the lower back or bone pain.