In the third trimester of pregnancy, if there is a slight lumbar pain, this is a normal manifestation and there will be no obvious symptoms of lumbar pain. If there is obvious lumbar pain, it may be a disease such as dampness, cold or lumbar spine growth or lumbar disc prolapse. If the pain is not particularly obvious, it does not require special treatment. Try to pay attention to rest and not to overexert yourself, because the hormonal secretion during pregnancy can lead to back pain and muscle aches, which are also related to the fetal position of the fetus during this period. In the third trimester, the fetus grows and the uterus grows, which will compress the nerves of the lumbar spine and may cause back pain. This situation usually pay attention to keep warm, do not get cold, try to pay attention to rest, do not overwork, after rest this phenomenon will be improved.