The normal human spine has four curvatures, cervical, thoracic, lumbar and sacral. Straightening of the cervical curvature is caused by improper posture, i.e., prolonged sedentary or frequent head down, or sleeping with a high pillow, which causes the cervical curvature to become smaller, i.e., straightened. There are many reasons for the straightening of cervical spine curvature. After the curvature is straightened, it will affect the height of the cervical spine and the elasticity of the cervical spine muscle tissue, which will produce pain and discomfort to the point of stimulating the nerves and blood vessels, causing symptoms such as dizziness and vertigo. The curvature of the normal cervical spine can increase the elasticity of the cervical spine, reduce and cushion the shock of gravity, as well as prevent damage to the spinal cord and brain. Long-term incorrect sitting and sleeping postures, as well as long-term cumulative strain injuries, cause dehydration of the nucleus pulposus of the intervertebral discs and change the normal height, and the cervical curvature gradually disappears or even straightens or bends, resulting in changes in the imaging performance of the cervical spine. The reduction or reversion of cervical curvature is one of the important reasons for the occurrence of cervical spondylosis, and it is also one of the bases for diagnosis through X-ray examination in clinical practice. Therefore, cervical curvature reversion or reduction of cervical curvature is one of the adverse consequences for cervical spondylosis. Imaging performance is also a method of diagnosis.