Hello, You are suffering from shoulder pain, to cure it you will have to get the cause cured. Shoulder pain can be due to a referred pain from the neck or a pinched nerve, frozen shoulder or trapped nerve, brachial neuritis. The upper left arm pain may be due to a problem in the bones, muscles, ligaments or tendons in the shoulder, rotator cuff tear or tendonitis. It may be indicative of arthritis, pancreatitis, symptom of heart attack , stroke or dislocation or fracture post injury. You are suggested to get clinically examined by a GP, to detect any cardiac problems, developing CAD, any chronic disease, etc., that needs urgent medical support and treatment. You will have to get few blood tests and imaging tests done. Your treatment will depend on the pathology detected and the severity of your symptoms. For relief, you can take NSAIDS, naproxen, one stat when pain after food. You can apply pain relieving sprays and ointments. Warm compression may be helpful. You can do the required exercises under a physical therapist. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Nupur K., General & Family Physician