The normal spine has four physiological curves, namely: cervical, thoracic, lumbar and sacral. The physiological curvature of the spine plays a very important role in maintaining the balance of the various parts of the body and cushioning the pressure. Under normal circumstances, as people age, the intervertebral disc degenerates, and in old age, due to dehydration of the nucleus pulposus, the intervertebral disc gradually degenerates and becomes thinner, the lumbar curve can gradually disappear, the physiological curvature of the lumbar spine becomes straight, and an age-related hunchback appears. In some young people, the physiological curvature of the lumbar spine is straightened for the following reasons: 1, the patient sits for a long time or works in one position for too long, the muscle and ligament strain around the lumbar spine, the stability of the lumbar intervertebral joint is reduced, and the physiological curvature of the lumbar spine is straightened. 2, lumbar muscle sprain patients due to severe lumbar pain, muscle and ligament spasm, pulling the lumbar spine caused by the physiological curvature of the lumbar spine is straightened. 3, lumbar intervertebral disc lesion Patients with degenerative disc degeneration, the corresponding intervertebral space performance is narrow in front and wide at the back, and straightening of the physiological curvature of the lumbar spine can occur. Straightening of the lumbar physiological curvature, narrowing of the intervertebral space between the corresponding vertebral bodies, and increased pressure on the intervertebral disc can increase the incidence of intervertebral disc lesions. When the physiological curvature of the lumbar spine is straightened, its function of maintaining upper body balance and cushioning pressure is greatly reduced, and it is easy to produce corresponding diseases. The physiological straightening of the lumbar spine is an important aspect in the diagnosis of lumbar spine disease and is a precursor to the development of lumbar spine disease.