Straightening of the physiological curvature of the cervical spine refers to the loss of the physiological curvature of the cervical spine and the loss of the curved convexity to the front (i.e., the physiological curvature of the cervical spine) that the normal cervical spine should have. In case of neck discomfort and suspected cervical spondylosis, it is often clinically necessary to do a frontal and lateral cervical spine X-ray examination, in which the normal curvature of the cervical spine is expressed as a continuous, smooth, arc-shaped curve protruding to the front at the posterior edge of each cervical vertebra on the lateral film of the cervical spine (equivalent to looking at the cervical spine from the right side of the person). If the cervical muscles become tense after a long period of improper sitting, strain, lack of activity of the cervical spine, spinal injury, spinal calcification, etc., the physiological curvature of the cervical spine will disappear and the physiological curvature of the cervical spine will become straight. If you cannot change your work and lifestyle in time, you will develop cervical spondylosis.