Myositis

DDx

Muscle inflammation

  • Polymyositis
  • Dermatomyositis
  • Systemic lupus erythematosus (SLE)
  • Scleroderma
  • Sjögren's syndrome
  • Inclusion body myositis
  • Trichinosis (Trichinella infection)
  • Sarcocystosis
Other causes of proximal muscle weakness
  • Polymyalgia rheumatica
  • Endocrine: hypothyroidism, hyperthyroidism, Cushing's syndrome
  • Alcoholism
  • Drugs: corticosteroids, statins, clofibrate, colchicine, chloroquine, emetine, aminocaproic acid, bretylium, penicillamine, drugs causing hypokalemia
  • HIV myopathy
  • Hyperparathyroidism
  • Spinal stenosis
  • Osteomalacia
  • Mitochondrial myopathy
  • Diabetic lumbosacral plexopathy

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Last updated: December 1, 2014