The sound of cervical vertebrae when shaking the head may be caused by the following factors: 1. There may be some physiological popping. This situation is often seen in patients who keep the neck fixed in a certain position for a long time, and then suddenly move, due to the sudden relaxation of some small ligaments, or the release of pressure inside the joints, then there will be popping. However, there is no local pain or unfavorable activity after the ringing.2. This situation may be caused by degenerative changes in the cervical vertebrae, such as the presence of cervical vertebral osteophytes, ligamentous hypertrophy, calcification, or herniation of the intervertebral discs. This kind of patients may have abnormal noise when shaking their necks, and may be accompanied by neck pain, stiffness, and unfavorable activities.3. This kind of situation may be caused by the instability of the cervical spine, for example, due to the trauma, degeneration of cervical spine, which leads to the instability of the cervical vertebrae or the existence of small joints in the misalignment, which will cause the related abnormal noise when moving the cervical vertebrae.4. This kind of situation also may be This is due to old trauma, such as cervical spine has old fracture, then after its recovery, may be left in the process of activity noise.