Different types of cervical spondylosis have different degrees of harm. For nerve root type cervical spondylosis with upper limb pain and numbness as the main symptom, the sensation and the strength of local muscles are mainly affected. When conservative treatment is ineffective and nerve paralysis occurs, weakening of the strength of the muscles innervated by the compressed nerve occurs, muscle atrophy will occur over time, numbness in the innervated area will last longer, and after the nerve itself has degenerated, it may not be restored even after reoperation. For spinal cord cervical spondylosis, if the spinal cord is already compressed and degenerated, even surgery cannot regenerate the necrotic nerve. The improvement of symptoms after surgery is due to the compensation of the nerve that is compressed but not yet degenerated and necrotic. Most unfortunately, in patients who have had the disease for a long time or who have had a sudden acute exacerbation due to trauma, sometimes the spinal cord has already undergone irreversible changes and will not improve completely after surgery, and postoperative symptoms that do not improve but do not worsen are sometimes the best outcome for patients who have delayed treatment.