Thyroid myopathy

• Facts:
  Can be caused by both hyperthyroidism and hypothyroidism
• History / PE:
  Proximal muscle weakness
  Fatiguability
  Tremor
  Anxiety
  Weight loss
  Sluggish relexes
• Diagnosis:
  Serum TSH
  Elevated CK concentration
• Differential Diagnosis:
  Polymyositis
  Dermatomyositis