Rattling of the bones in front of the chest is generally a normal phenomenon, mainly because the front of the human body is the location where there are more joints in the human body, not only the sternoclavicular joints, but also a number of sternoclavicular joints on both sides of the human body, as well as the stalk joints on top of the sternum, which are all micro-movement joints, that is, joints that can be deformed by slight movements. If these joints are moved beyond the range of the joints, the joints may become temporarily slightly misaligned. Once the chest is stretched or the upper extremities are moved appropriately, the anterior thoracic joints may be repositioned, resulting in a localized rattling sound. As long as there is no local pain or other symptoms such as limited movement, it is generally normal to have a local rattling sound, but once there is pain or local pressure pain, it is necessary to seek medical attention.