Neck stiffness and headache are commonly caused by the following reasons: first, strain on neck muscles, strain on neck muscles after overexertion, causing stiffness, tension and spasm of neck muscles, and compression of occipital nerve can lead to pain in the posterior occipital area. Second, cervical spondylosis, cervical disc herniation and hook vertebral joint hyperplasia can compress the nerve roots and vertebral artery, the nerve roots can cause neck pain after compression, the neck muscles contract continuously due to pain, resulting in local stiffness, the vertebral artery can spasm and narrow after compression, causing cerebral blood supply insufficiency, resulting in head pain symptoms, cervical spondylosis attack sympathetic nerve stimulation, can also cause the vertebral artery contraction spasm, resulting in cerebral blood supply insufficiency. The sympathetic nerve is stimulated during the attack of cervical spondylosis, which can also cause the vertebral artery to contract and spasm, resulting in inadequate blood supply to the brain and head pain.