Narrowing of the subarachnoid space in the cervical spine can lead to cervical pain, numbness of the limbs, movement disorders and other clinical symptoms, which need to be treated in time to avoid delaying the condition and leading to adverse consequences. Cervical subarachnoid space refers to a wide gap between the arachnoid membrane of the spinal cord and the soft spinal membrane, the outer layer of which is the dura mater. In spinal cord cervical spondylosis, a herniated disc compresses the dura mater, thereby narrowing the subarachnoid space. The narrowing and compression of the subarachnoid space will cause nausea, dizziness, numbness of the limbs, and in severe cases, movement disorders, even brain herniation, as well as a variety of intracranial organic lesions. The appearance of the above symptoms need to go to the hospital in a timely manner, according to the cause of targeted treatment, to alleviate the clinical symptoms, to avoid aggravation of the condition.