Above the right breast is the pectoralis major muscle, on the anterolateral side of the right pectoralis major muscle, there are relatively superficial lymph nodes, on the deep side of the pectoralis major muscle there is the pectoralis minor muscle, and further down are the ribs and intercostal muscles. The rib cage here is made up of rib cartilage, and below the rib cage and intercostal muscles is the interior of the body’s thoracic cavity, where the main contents are the lobes of the right lung. In the area above the right thoracic cavity, there are important blood vessels and nerves passing through. Here are the subclavian arteries and veins and the nerves associated with the brachial plexus, which are important structures, passing from the area below the right clavicle and between the right thorax, and up here are the areas associated with the neck, where there are the muscles of the neck and the large blood vessels of the neck. The area above the right breast is clinically the most common site for painful symptoms, which are caused by lesions such as costochondritis, rib injuries, and muscle strains in this area. In addition, if the patient develops pneumonia or pneumothorax, the pain may also be caused.