Why do the muscles in my upper arms hurt? - Rheumatoid Arthritis

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I have RA in the joints but my muscles in the upper arms are the only ones that go really stiff. Does muscle pain go hand in hand with RA? Hel...

Living with Rheumatoid Arthritis (RA) can cause the muscles in your upper arms to hurt. Find out why: http://j.mp/q7zHYU #RA

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