The chest bone below the clavicle is the human sternum, and below the clavicle is also the location of the 1st thoracic rib joint. Most pain in this location is directly related to injury and inflammation of the 1st thoracic rib joint. The sternocostal joint is one of the very few joints in the body that is immobile. However, the joints surrounding the sternocostal joint, such as the sternoclavicular joint and other sternocostal joints, and even the stalk joint on the sternum, are all mobile joints. This causes a phenomenon where the 1st sternoclavicular joint is subjected to significantly greater pulling forces when other joints in the chest are moving, resulting in localized injuries that can easily cause pain in the bones of the chest below the clavicle. After the painful symptoms appear, it is usually necessary to apply blood-activating drugs locally, together with oral blood-activating and pain-relieving drugs for about 3 days, and if the symptoms are not relieved, it is necessary to consult a doctor promptly.