How is muscle weakness characterized in polymyositis?

Updated: Jun 13, 2020
  • Author: Mythili Seetharaman, MD; Chief Editor: Herbert S Diamond, MD  more...
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Muscle weakness in polymyositis is symmetric and proximal. It is not painful, although a minority of patients report aches or cramps. On occasion, the muscle may be sore to palpation and may have a nodular and grainy feel.

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