Why is there often a delay in the diagnosis of polymyositis?

Updated: Jan 05, 2021
  • Author: Mythili Seetharaman, MD; Chief Editor: Herbert S Diamond, MD  more...
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Symptoms of polymyositis gradually develop over a period of 3-6 months. Diagnosis is usually delayed, because, unlike in dermatomyositis, no associated rash occurs before the onset of muscle disease. Family history and medication history are important in excluding other causes of myopathy.

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