Chest pain and shoulder pain may be related to the following causes: 1. They may be caused by excessive exercise, such as excessive exercise involving the upper limbs, such as excessive bench presses, which can easily cause muscle pain after exercise. 2. They may be caused by cervical spondylosis. In the process of developing neurogenic cervical spondylosis, it may cause radiating pain in the above two areas. 3, it may be caused by the injury related to the clavicle, for example, when a clavicle fracture occurs, it will often cause pain in the chest and shoulder joints on this side at the same time. 4, it may also be caused by a strain on the chest muscles, for example, if the patient causes a strain on one side of the pectoral muscles while doing intense activities of the upper limbs, it may be caused by a strain on the pectoral muscles. For example, if the patient strains the pectoral muscles while doing vigorous upper limb activities, it may cause pain in the chest and pectoral muscles at the shoulder joint stop at the same time. Finally, this condition may also be caused by heart-related diseases, such as myocardial infarction, which may cause pain in the left chest and left upper limb at the same time.