Vertebral artery cervical spondylosis can cause a lack of blood supply to the brain. The pathogenesis of vertebral artery cervical spondylosis is due to some kind of disease, more commonly transverse foramen stenosis caused by osteophytes or cervical spondylolisthesis or cervical instability. It is the vertebral artery that passes through the transverse foramen, and when the foramen is narrowed, it leads to pressure on the vertebral artery, which is two of the four blood vessels supplying blood to the head, and thus causes vertebral artery stenosis. Once the vertebral artery is compressed, it will inevitably lead to abnormal blood supply to the head, resulting in insufficient blood supply to the vertebrobasilar artery, so vertebral artery cervical spondylosis can cause insufficient blood supply to the brain.