If you're experiencing pain in the upper right arm muscle, it could be due to several reasons. The most common causes include muscle strain, overuse or repetitive motion, injury, or inflammation. It's important to assess any recent activities or movements that may have contributed to the pain. If the pain persists or worsens, it's advisable to consult a healthcare professional for a proper diagnosis and appropriate treatment.

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You need to see a physician for further work up.

This could be coming from a multitude of reasons, all of which can most likely be treatable conservatively (without surgery). In all probability it is due to a strain or impingement in a shoulder muscle, or it is radiating from an irritated nerve in your neck. In most cases it will go away on its own. If it doesn’t within a couple weeks or worsens, see your doctor or a physical therapist. It is difficult to say what it is coming from without evaluating you.

Most common cause of pain in this general area is shoulder rotator cuff tendinosis.See an orthopedic surgeon to confirm and treat

Good question, one of which I cannot answer from the information provided. I would recommend seeking a consultation with a local PT.