Sternal ringing when lifting the chest may be caused by the following reasons: First, it may be caused by a sterile inflammation of some small joints around the sternum. For example, the sternoclavicular joint on the left and right side of the sternum or the rib-thoracic joint may cause similar symptoms when such inflammation occurs. Second, this condition may be caused by old damage to the sternum. For example, if the patient has an old fracture of the sternum, if the recovery is poor, there may be some small fracture pieces or bone discontinuity in the local area. At this time, in the process of the patient moving the thorax, it may induce a strange sound here. Third, this situation may be caused by sternoclavicular joint dislocation. If the sternoclavicular joint is dislocated due to a trauma to the shoulder, it may cause abnormal movement of this joint during the patient’s thoracic extension, which may result in abnormal sound. Fourth, this condition may also be caused by some other joint lesions. For example, if the patient has frozen shoulder or misaligned small joints of the thoracic spine, it is possible that the sound may occur when the patient lifts the chest, and the patient may mistake it for the sound of the sternum.