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Polymyalgia Rheumatica (PMR) | Last Active: May 29 8:15am | Replies (26)
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I don’t know for sure since I’m new to PMR, but I think there is a muscle factor with PMR , but not with arthritis.
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There is definitely muscle involvement with PMR.
Another difference is that PMR stiffness and pain generally reduces as the day goes on but arthritic pain gets worse through the day.