Depending on the location and degree of cervical spine instability, there may be neck stiffness, soreness, dizziness, back pain, limb numbness, weakness and so on. Cervical spine instability refers to the decrease in stability of the cervical spine, which may cause the neck to twist or move beyond the normal range of anterior flexion and posterior extension, resulting in damage to the surrounding tissues, and sometimes there is no obvious discomfort at a lesser degree, while a heavier degree may result in stiffness of the neck, soreness, and other discomforts. Atlantoaxial and cardinal spine instability may have headache, dizziness, lower cervical spine instability may appear back pain, if the compression of the nerve, there may be numbness in the innervated area of the limbs, weakness, walking instability. Cervical spine instability should go to a regular hospital in time, and the doctor will decide whether the discomfort is caused by instability according to the symptoms, signs and auxiliary examination, and standardize the treatment.