Pain in the back of the left scapula is a possibility of lung cancer, but of course this symptom is not usually considered to be lung cancer in the first place when it occurs, it is mostly caused by factors such as myofasciitis and soft tissue injury. Typical symptoms of lung cancer are coughing, coughing up sputum or blood in the sputum, chest tightness, breathlessness and difficulty in breathing, which may be accompanied by irregular vague or dull pain in the chest, which may sometimes occur in the advanced stages of lung cancer.
Therefore, it is impossible to clarify whether it is lung cancer by the symptom of pain behind the left scapula alone, and timely medical examination is needed to clarify.