There are three bones in the shoulder: the clavicle, scapula and humerus. The clavicle is located in the upper part of the thoracic cavity, one on each side, and can be touched as one of the body surface markers, and is an elongated “S” shaped bone connecting the scapula and the sternum. The clavicle is located under the epidermis and is susceptible to fracture by external forces, and is more frequent in children and adolescents. The scapula is more prominent and is located behind the thorax, between the second and seventh ribs, in the form of a triangular flat bone. There are three major fossae at the scapula: the subscapular fossa, suprascapular fossa, and infrascapular fossa. The lateral projection of the scapula is called the acromion, which is connected to the clavicle, and the body marker of the chest is the vertical line made at the lower corner of the scapula. In life, scapular pain, tissue strain causes most of the pain, need to properly reduce the amount of labor and rest, improper posture can also cause pain, then need to change the position, appropriate exercise, massage, etc. for relief. The humerus is the thickest bone in the upper arm, between the shoulder and elbow joints, the shoulder joint is formed by the humerus and scapula, the elbow joint is formed by the humerus, radius and ulna, the humerus contains two parts, the humeral head and humeral body, easy to receive external force and cause fractures.