Mid-pregnancy physiological causes of back pain caused by sleeping can be adjusted by adjusting the sleeping position, massage and other pain relief, lumbar spine disease caused by adjusting the sleeping position, if necessary, surgical treatment. 1. Physiological reasons: after pregnancy due to laxity of joint ligaments, coupled with the influence of the enlarged uterus will make the body center of gravity forward, some pregnant women will be in the mid-pregnancy of a slight low back pain, and in the sleep will also cause the symptoms of lumbar back pain, can be through the choice of a comfortable position to sleep, appropriate massage and pay attention to the back of the back warmth, etc. can relieve the pain. 2. Lumbar spine disease: due to the pregnant woman’s body after pregnancy to increase weight-bearing, may be aggravated to a certain extent the original lumbar spine disease, and will appear in mid-pregnancy after sleeping caused by lumbar back pain symptoms, can comply with the doctor’s advice to pay attention to rest, sleep on a hard board bed, avoid standing for a long time, and under the guidance of the doctor to give appropriate massage to relieve the pain, if necessary, need to be in the postnatal surgical treatment. When sleeping in mid-pregnancy back pain is obvious, you need to go to the hospital in time, and find out the cause, and actively deal with it.