Why does cervical spondylosis cause vertigo

Cervical spondylosis causes vertigo, and its type related: 1, vertebral artery type cervical spondylosis: vertebral artery stenosis, pressure, pressure on the vertebral artery, it will reduce blood supply to the brain, or bone spur pressure has partial stenosis, when the patient rotates the position, blood vessels are pulled, more narrow, brain once there is no blood supply, dizziness;2, sympathetic nerve type cervical spondylosis: Because sympathetic nerve endings are excited, vasoconstriction, occlusion of vertebral arteries does not supply blood to the brain, so patients will continue to faint.