Insufficient blood supply to the vertebral basilar artery is not cervical spondylosis, which is two completely different diseases, but cervical spondylosis can cause insufficient blood supply to the vertebral basilar artery. Insufficient blood supply to the vertebral basilar artery is also related to atherosclerosis, which leads to a decrease in the elasticity of blood vessels and thickening of the lumen wall, causing insufficient blood supply to the vertebral basilar artery, whereas cervical spondylosis is a disease that is based on degenerative pathological changes of the intervertebral discs, which is due to the cervical spinal cord strain, osteophytes, or herniated discs that lead to compression of the nerve roots in the neck. Many cases of insufficient blood supply to the vertebral basilar artery are caused by cervical spondylosis, which is related to the anatomical alignment of the vertebral basilar artery. The bilateral vertebral arteries start from the right and left subclavian arteries and travel upward through the sixth cervical vertebra to reach the foramen transversarium of the first cervical vertebra before entering the skull through the foramen magnum. In other words, the vertebral arteries travel through a bony tunnel with great mobility. Once the cervical vertebral osteophytes and herniated discs easily compress the vertebrobasilar artery, resulting in insufficient blood supply to the vertebrobasilar artery. Therefore, insufficient blood supply to the vertebral basilar artery is not a cervical spondylosis, and it needs to be treated systematically under the guidance of a doctor, avoiding blindly using medication on one’s own.