Myopathy is a disease which causes muscle weakness, twitching, dysfunction, pain, stiffness, and/or deterioration. It can be classified as either neuromuscular or musculoskeletal, as well as be characteristic of both as in certain cases of myositis, muscular inflammation. Treatment depends on the type of myopathy, as there are many, either genetic in origin or acquired. 

Types of myopathy include:

  • Congenital myopathies – delays in the development of muscle control
  • Muscular dystrophies – degenerative deterioration of voluntary muscles
  • Mitochondrial myopathies – genetic abnormalities in mitochondria
  • Glycogen storage diseases of muscle – mutations in genes controlling enzymes that metabolize glycogen and glucose (blood sugar)
  • Myoglobinurias – disorders in the metabolism of fuel (myoglobin) used by muscles
  • Dermatomyositis – skin and muscle inflammation
  • Myositis ossificans –  growths of bone within muscle
  • Familial periodic paralysis – episodes of arm and leg weakness
  • Polymyositis – inflammation of skeletal muscle  
  • Neuromyotonia – alternating episodes of twitching and stiffness
  • Stiff-man syndrome – episodes of rigidity, reflex spasms, common muscle cramps and stiffness
  • Tetany – prolonged spasms of the arms and legs


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