The common causes of head pain from falling pillow are joint misalignment leading to insufficient blood supply to the vertebral artery and aggravation of cervical spine diseases, as follows: First, mild misalignment of cervical joints: when falling pillow occurs, patients will have mild misalignment of cervical joints, and the tissues around the joints will also be severely edematous, leading to stiff neck and corresponding changes in cervical curvature, causing insufficient blood supply to the brain, and patients will have spasm and stenosis of the vertebral artery, so they will have Headache symptoms; second, cervical spine disease aggravation: drop pillow occurs will also aggravate the original cervical spine disease, such as cervical disc protrusion, cervical spinal stenosis, will cause nerve stimulation, thus causing head pain symptoms, most patients have sympathetic cervical spondylosis, in addition to headache may also be accompanied by changes in blood pressure. Therefore, patients with severe head pain need to be seen in a timely manner, and the symptoms can be controlled through treatment.