The back of the back will be comfortable with a ringing sound, this situation is the back part of the thoracic spine synovial joint dysfunction, usually with some slight displacement, so that it is easy to cause the surrounding soft tissue in a state of fatigue, and the surrounding joint capsule and the peripheral nerves within the joint capsule will be stimulated, there will be uncomfortable feelings. The sound of resetting by back pressure means that the instability of the synovial joint is effectively lifted, so that the surrounding soft tissues are not stimulated and relaxed, and the peripheral nerves are not stimulated, so that a comfortable sensation occurs. This situation is mainly due to the frequent low head ambulation to read cell phones, computers, reading, reading newspapers, etc., low head time is too long; may also be due to the pillow is too high when sleeping, the cervical vertebrae in a forward leaning state, which will easily lead to the back of the thoracic vertebrae position synovial joints, joint dysfunction, the above situation.