Always wanting to yawn means insufficient blood supply and oxygen supply to the brain, possibly caused by cervical spondylosis, because cervical spondylosis in the case of a herniated cervical disc will stimulate the vertebral artery of the cervical spine, which will lead to spasm of the vertebral artery, narrowing of the lumen and insufficient blood supply, insufficient blood supply to the cervical vertebral artery will directly lead to insufficient blood supply and oxygen supply to the brain, which will instead stimulate the reflex center of the body and produce yawning, producing a Deep breathing promotes the increase of local blood nutrients. In addition, total yawning may be related to certain diseases of the brain, such as spasm of the cerebral artery or narrowing of the cerebral artery lumen, which can lead to insufficient blood supply to the brain.