The cervical spine has a normal physiological curvature, curvature has a special measurement method, in the posterior edge of the dentate process to make a line, and down each vertebral body to make a line, this line is the arc, in the posterior edge of the dentate process to make a vertical straight line, this arc and the maximum distance between the straight line is the physiological curvature measured by the value. The maximum distance between this curve and the straight line is the value of physiological curvature. If the patient works long hours or lowers his head too much, the physiological curvature of the cervical spine will straighten and disappear over time, and the patient will experience a series of symptoms, such as neck pain, nausea, vomiting, difficulty in swallowing, headache and abnormal blood pressure, as well as radioactive pain and numbness in one upper limb. If the patient has no other symptoms but simply has straightening of the physiological curvature of the cervical spine, he or she can choose not to go for treatment for the time being, and usually tilts the head more and lowers it less, and uses a special cervical pillow. If symptoms of cervical spondylosis appear, you can choose symptomatic treatment, oral medication or physical therapy, and if necessary, surgery.