Headache and shoulder pain are mostly caused by cervical spondylosis, which includes peri-cervical disease and cervical spine disease. 1. Most patients with peri-cervical disease are caused by mental tension, stress or prolonged looking down at the cell phone or playing with the computer, which mainly manifests as neck and shoulder pain and discomfort caused by contraction and spasm of the neck and shoulder muscles, and can involve the scalp nerves and blood vessels when the neck muscles are contracted and spasmed for a long time. In severe cases, dizziness, nausea, vomiting, balance disorder and ataxia may also occur, mainly due to insufficient blood supply to the basilar artery system.2. If the patient has a cervical disc herniation, it may cause serious cervical medullary compression, resulting in sensory impairment of the extremities and motor impairment, and in severe cases, it may also cause paraplegia, and some patients may even have urinary and fecal abnormalities.