Pain in shoulder, neck and left arm mostly could be due to nerve impingement seen in cerival vertebral diseases or any nerve impingement near neck like cervical rib. A neck X-ray must be done first to see any disc prolapse or cervical spondylosis. If it is associated with breathing or respiration problems it could be associated with cardiac conditions. Get an ECG done for safe side. Consult a physician for further management.
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