The cervical spine is in a certain posture for too long, resulting in muscle tension, inflammation of the fascia pain, pain mainly to soreness, swelling pain. If the time spent on the pillow is relatively short, the pain is relatively mild, and only the symptoms of the neck can appear. If the pillow is long, the muscle edema is more obvious, and in addition to severe neck pain and restricted cervical movement, it can also be accompanied by dizziness, headache, nausea, vomiting and other symptoms of stimulation of the vagus and sympathetic nerves. In addition, there can be radiating pain in the upper extremities bilaterally, and the pain is mainly discharge-like pain and pulling-like pain. This is mainly due to the clinical manifestations such as straightening or retroflexion of the physiological curvature of the cervical spine and compression of the nerve roots after the fall of the pillow. In addition, it may also lead to misalignment of the small joints of the cervical spine and compression of the dural bursa or spinal cord by the cervical spine physiological bending, which may lead to weakness of both lower limbs, unstable walking and other manifestations of spinal cord injury, and severe cases may lead to shock due to severe pain.