In daily life, many people find that they often have a “clicking” sound when they turn their necks. Moreover, some people feel comfortable after the ringing. People worry if there is something wrong with their cervical spine. This “click” sound is actually a popping sound of the cervical spine synovial joint, which is the sound formed by the negative pressure vibration of the gas in the joint capsule as the synovial joint moves slightly when the cervical spine is rotated or extended and flexed. Generally not accompanied by pain, or cervical spine activity is limited, in this case we can live a normal life, without deliberate concern, do not need to worry. However, it is best not to do this action for a long time, so as not to cause strain on the synovial joints and relaxation of the joint capsule, and then neck symptoms will appear. However, if the cervical spine for a long time this “click” sound, the frequency of the sound is particularly high, sometimes a slight rotation, there will be a ringing sound, and accompanied by symptoms of neck discomfort, this is a physiological signal to our body —- cervical small joint capsule synovial fluid reduction, joint strain, joint cartilage has been worn. Long-term development, it is very easy to cause neck pain and limited activities. This requires timely hospital consultation, cervical spine front and side, dynamic position, and even cervical spine CT and MR examination, to clarify the cause, early prevention and treatment.