Idiopathic inflammatory myopathies (IIMs)
Inclusion body myositis
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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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
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