Shoulder pain and chest pain may be caused by the following reasons: 1, there may be trauma to the thorax, such as a direct impact to the thorax in a car accident, which can easily cause fractures to the scapula, clavicle, ribs, etc., resulting in pain in these areas, as well as pneumothorax and hemothorax, resulting in breathing difficulties. 2, it may be caused by overexertion. For example, if the patient has done excessive exercise, resulting in muscle fatigue or a large amount of lactic acid deposition in the shoulder and chest, followed by pain in the above-mentioned areas when the patient rests. 3, if there is pain in the left shoulder and chest at the same time, it suggests that there may be heart-related diseases, such as acute myocardial ischemia or infarction. 4, common in the process of the onset of neurogenic cervical spondylosis, during the attack of this disease Due to the stimulation of the nerve roots, radiating pain may be produced in the shoulder and chest on one side at the same time.