Low back pain is a relatively common manifestation of pregnant women in mid-pregnancy. Due to the increase of abdomen and change of body posture, the muscles, ligaments and bones of the waist are changed and it is easy to feel low back pain. It can be relieved by rest, hot compress, massage, change of posture, calcium supplementation and mood adjustment. 1. rest: bed rest, taking a side position with legs flexed during rest can reduce the state of muscle tightness; 2. hot compress: a warm towel or hot water bag can be applied to the affected area to reduce the pain symptoms; 3. massage: under the guidance of a doctor, massage the affected area to relieve the symptoms of muscle aches and pains, or go to the hospital 4, change the posture: pay attention to correct poor standing and sitting posture, such as bending, hunchback or crossed legs; 5, calcium supplementation: if the lack of nutrients such as calcium, phosphorus and other nutrients during pregnancy, will cause the pregnant woman’s bone softening decalcification, due to calcium deficiency will also cause low back pain. It is recommended that pregnant women should pay special attention to calcium supplementation throughout pregnancy; 6, mood regulation: you can use methods such as listening to music to keep your mood relaxed or changing your attention to improve the symptoms of low back pain. When the above methods do not relieve low back pain, and the pain symptoms are getting more and more serious, you need to pay attention to it, and should go to the hospital in time to do relevant examinations to exclude any other organic diseases.