Your symptoms are most likely related to a
musculoskeletal disorder or injury. The shoulder joint is very complex and can sustain damage from injury or "wear and tear".
Because your pain is chronic, and limits range of motion, it is not typical of the radiating pain caused by myocardial ischemia. If you experience chest pain, dizziness, shortness of breath, or a sudden increase, or change in quality, of the pain in your arm you should go to ER. Schedule an appointment for your yearly physical if you have not yet had one.
You should also complete a breast self exam, and schedule your Pap and Breast exam if it has been more than a year, or you feel a lump or tissue change of any kind.
To deal with the arm pain in the meantime:
Ice entire shoulder 15-20 minutes twice daily
Nonsteroidal anti-inflammatory drugs (NSAIDs)(unless you have a history of stomach pain or ulcer) Take as directed.
As inflammtion and range of motion begins to improve you will be able to progress to gentle stretching exercises.
If pain persists for several weeks, your Doctor may refer you to a Physical Therapist, prescribe anti inflammotories safe for longer term use, and possibly an MRI to look for causes.
I wish you the very best of luck and hope for a healthy future.
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