How is polymyalgia rheumatica differentiated from rheumatoid arthritis (RA)?

Updated: Feb 07, 2020
  • Author: Howard R Smith, MD; Chief Editor: Herbert S Diamond, MD  more...
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Polymyalgia rheumatica occasionally causes polyarthritis in patients older than 50 years, but these patients have chiefly proximal muscle pain and stiffness and remain negative for rheumatoid factor (RF).

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