Recently, we consulted a post-surgical headache patient who was diagnosed with cervical spondylosis after examination due to discomfort in the posterior occipital region and collar area, accompanied by headache and tinnitus. Why can cervical spondylosis also cause headache? Clinically, headache caused by cervical spondylosis is mainly due to the following five reasons: (1) Cervical spondylosis involves the cervical muscles, causing lasting spasmodic contraction of the cervical muscles, resulting in impaired blood flow to the muscles, which can free lactic acid, 5-hydroxytryptamine, bradykinin and other pathogenic substances and cause headache. (2) Cervical spondylosis directly stimulates, compresses or pulls headache-sensitive tissues in the head and causes headache. (3) The lesion can irritate, compress or damage the first, second and third pairs of cervical nerves and cause headache, especially in the occipital region, and can also cause pain radiating to the head through the reflex action of the medulla oblongata or the trigeminal nucleus of the spinal cord. (4) The lesion may stimulate or compress the sympathetic plexus around the pushing vein or other sympathetic nerves in the cervical area, causing headache due to impaired diastole of the vertebrobasilar system or the intracranial and external arteries. (5) In cervical spondylosis of the pushing vein type, the lesion directly involves the pushing vein and causes headache due to insufficient blood supply to the vertebrobasilar artery system.