Pain at the left scapula may have the following causes: 1. Scapular disease. For example, tumor of the scapula or metastasis of the scapula, can appear bony pain of the scapula, then the relevant CT examination should be carried out to make a diagnosis. 2, heart disease. If the heart has a heart attack or angina pectoris, it can reflexively appear pain at the scapula of the left shoulder. 3, myofasciitis. Myofasciitis is often a pain in the inner scapula, which can radiate to the left upper limb, often when exertion, cold or sleep pressure at night, the pain is very obvious, then the relevant tests should be carried out for diagnosis. 4. If it is due to a lung tumor or tuberculosis, which occurs in the upper lobe or the tip of the lung, there will be pain at the left scapula.