Inflammation of muscle tissue, which can be caused by infection, autoimmune disorders, or certain medications. It typically presents with muscle pain, weakness, and sometimes swelling.
From Greek 'myo' meaning 'muscle' and '-itis' meaning 'inflammation.' The term was established in medical terminology during the 19th century as understanding of muscle pathology advanced.
Polymyositis, a form of autoimmune myositis, can make simple tasks like climbing stairs or lifting your arms above your head nearly impossible as your own immune system attacks your muscles. Some cases are triggered by viral infections that confuse the immune system.
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