Pregnancy back pain may be caused by physiological factors, pathological factors and so on. 1. Physiological factors: during pregnancy, due to laxity of joint ligaments, the enlarged uterus protrudes forward, causing the center of gravity of the body to shift backward and the lumbar vertebrae to bulge forward, so that the dorsal extensor muscles are in a state of constant tension, often resulting in mild low back pain. 2. Pathological factors: spinal diseases, paraspinal soft tissue diseases, spinal nerve root lesions, rheumatic diseases, other diseases such as kidney stones may cause low back pain during pregnancy. If the low back pain is obvious, we should find out the cause in time and treat it according to the etiology, if necessary, bed rest, local hot compresses and medication. If you have any discomfort during pregnancy, consult a doctor in time.