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Myositis

Names

Myositis
Idiopathic inflammatory myopathies (IIMs)
Polymyositis
Dermatomyositis
Inclusion body myositis
Juvenile myositis

Description

Myositis is inflammation of the muscles, which may cause muscle weakness, swelling, and pain. Polymyositis, dermatomyositis, inclusion body myositis, and juvenile myositis are all specific types of myositis.

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Prevalence

50,000 to 75,000 people in the United States

Typical Age of onset

Adults between ages 30-60 and children between ages 5-15

Symptoms

  • Trouble rising from a chair

  • Difficulty climbing stairs or lifting arms

  • Tired feeling after standing or walking

  • Trouble swallowing or breathing

  • Muscle pain and soreness that does not resolve after a few weeks