As people age, cervical spondylosis often occurs in people over 40 years old and is mostly accompanied by headaches, dizziness, and numbness in the shoulders and neck. What are the reasons for these phenomena? This degenerative change often narrows the intervertebral foramen, thus compressing the nerve roots. Once the occipital nerve is compressed, there will be pressure pain in the cranial part of the occipital nerve, radiating to the top of the head, manifesting as head swelling pain, and when the patient bends the head back and maintains lateral flexion, pressure from above will appear from the neck to the shoulder and upper arm. If the degeneration is caused by nucleus pulposus prolapse, bone spur, hypertrophic calcification of ligament, etc., it can directly compress the spinal cord, and even compress the spinal cord blood vessels to cause degeneration and softening of the spinal cord, and the patient often has dull numbness, headache and dizziness below the neck, and sometimes asymmetric lower limb paralysis and hyperreflexia of the lower limbs are seen. In addition, cervical spondylosis often narrows the vertebral artery, resulting in insufficient blood supply to the vertebrobasilar artery, resulting in headache with vertigo, a sense of rotation, such as riding on a boat, or walking like stepping on cotton, seeing things as if covered by a layer of fog, etc. Therefore, we should pay attention to the neck not to keep a posture for a long time, move the neck and shoulders appropriately, sleep on a pillow neither too high nor too low, avoid smoking, etc.