Pregnant women’s back pain and leg pain are related to maintaining a regular posture during pregnancy, such as sedentary and standing for a long time. Due to the increase in body weight in the late stage of pregnancy, the weight-bearing joints such as lumbar, knee and ankle joints will increase accordingly, which will lead to joint pains and lumbar pains, and the lumbar region will be subjected to a relatively large amount of stress, which may lead to ligamentous laxity, and the sacroiliac joints inflammation that occurs in many women after pregnancy is also related to this factor. During pregnancy, pregnant women secrete more hormones, which may also lead to the relaxation of the corresponding ligaments, thus triggering lumbar pain and leg pain, and is also related to the primary diseases of pregnant women. Some pregnant women may have lumbar disorders before pregnancy, such as lumbar muscle strain, lumbar disc herniation, lumbar spinal stenosis, osteoarthritis of the knee, which will aggravate the primary disorders with the increase of lumbar stress during pregnancy.