The incidence of cervical spondylosis is on the rise year by year due to frequent desk work, playing with cell phones and computers with heads down, and not paying attention to keeping the neck warm, etc. The neck pain, restricted movement, and dizziness and nausea caused by cervical spondylosis seriously affect the quality of life and daily work. So, why does cervical spondylosis cause dizziness? The cervical spine is the hub that connects the head to the body and is the only channel for nerves and blood vessels. It is responsible for sending instructions from the brain to all parts of the body and also sending various nerve messages from the body to the brain through the cervical spine. When cervical spondylosis occurs in the following conditions, it will cause symptoms such as dizziness and nausea: (1) Cervical spondylosis causes prolonged spasmodic contraction of the neck muscles, resulting in obstruction of blood flow to the muscles, freeing up pathogenic substances such as lactic acid, 5-hydroxytryptamine, bradykinin, etc., and causing dizziness and nausea. (2) Cervical spondylosis can directly stimulate the sensitive tissues of the head to cause dizziness and nausea. (3) Cervical spondylosis stimulates or compresses the sympathetic plexus around the pushing vein, resulting in dizziness and nausea caused by diastolic disorders of the vertebrobasilar system or the intracranial and external arteries. (4) In patients with cervical spondylosis of the pushing vein type, the lesion directly involves the pushing vein, causing dizziness and nausea due to insufficient blood supply to the vertebrobasilar artery system.