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Polymyositis

Evidence: Antibody

Names

Description

Polymyositis
PM

Polymyositis is inflammation of muscle tissue, causing chronic muscle weakness in both sides of the body.

Bloggers

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Prevalence

US Cases: 16,000 - 70,000 [Cheeti 2020], but this is unsubstantiated and includes dermatomyositis, which reports the same prevalence and therefore double counts this number.

Typical Age of onset

Typically, polymyositis occurs after age 20. But it most commonly affects individuals between the ages of 31 and 60.

Symptoms

  • Inflammation of muscles

  • Muscle weakness in muscles of trunk (hips, thighs, shoulders, upper arms, and neck)

  • Difficulty climbing stairs

  • Difficulty lifting arms

  • Fatigue

  • Shortness of breath

  • Fever

  • Weight loss

  • Joint pain

  • Difficulty swallowing