Definition of cervical spondylosis: It is called cervical spondylosis when the symptoms and signs are caused by degeneration of the cervical disc and its secondary changes that irritate or compress the adjacent spinal cord, or nerves, or vascular tissue. Incidence: According to the survey results, 25% of people around 50 years old have suffered or are suffering from cervical spondylosis, which increases exponentially with age. And it is found that there is a trend of cervical spondylosis becoming younger, and more and more young people are suffering from cervical spondylosis. From the connotation of the concept of cervical spondylosis, it can be seen that cervical spondylosis must include the following: 1. Degeneration of the cervical intervertebral disc is the basic lesion basis. The disease is first of all a degenerative degeneration-based disorder, which means that if the cervical disc does not degenerate and protrude to compress the spinal cord, it is due to other causes of disc protrusion, such as trauma, then it cannot be diagnosed as cervical spondylosis. 2, the cervical spine degeneration based on a series of secondary changes. This includes anatomical structural and dynamic abnormalities. The former changes include nucleus pulposus herniation, prolapse and subperiosteal hematoma of the ligament, bone spur formation and secondary spinal stenosis. Dynamic changes include cervical instability, such as intervertebral loosening and loss of physiological arc. These pathophysiological and pathological anatomical changes constitute the basis for the pathogenesis of cervical spondylosis. 3. compression of the adjacent spinal cord, or nerve, or vascular tissue, and causes symptoms and signs. If only cervical disc degeneration is present and causes a series of secondary changes, but no corresponding symptoms and signs, cervical spondylosis cannot be diagnosed. Cervical degeneration and cervical spondylosis should never be simply equated. For example, some people with a herniated cervical disc or a severe cervical spine spur cannot be said to have cervical spondylosis because they have no corresponding clinical manifestations, even though they have compressed the spinal cord.