If the cervical spine is bad, it may cause head pain, as follows: 1. Change the physiological curvature of the cervical spine: make the vertebral artery blood supply insufficient, the patient will have clinical symptoms of cerebral ischemia, such as head pain, dizziness, nausea, etc. 2. Make the neck muscles continuously tense: affect the movement of the head and neck, stimulate the posterior occipital nerve, which will cause clinical symptoms of pain behind the occiput. 3. Stimulate the sympathetic nervous system: cause sympathetic nerve tension and excitement, and the patient’s blood pressure will increase, thus causing severe pain in the head. Therefore, bad cervical spine can cause head pain, and timely treatment of the disease is necessary to prevent the occurrence of headache.