Small and non-small cell lung cancers cause similar symptoms. Sometimes, symptoms do not appear until the cancer reaches a later stage.  The symptoms of small and non-small cell lung cancers are similar, but small cell lung cancer spreads more rapidly. A person may be more likely to experience symptoms after lung cancer has reached a later stage.  Shoulder pain often occurs due to inflammation or muscle injuries. Less frequently, shoulder pain can be a symptom of lung cancer. Although shoulder pain is not a common symptom of lung cancer, any persistent, unexplained pain warrants a visit to a doctor for further investigation. ”

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