Myopathies

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Causes and Risk Factors

Inheritable myopathies are caused by a genetic defect. The most common muscular dystrophies, Duchenne and Becker MD, result from a genetic defect on the X chromosome.


Risk factors for other myopathies include the following:

Autoimmune disorders (e.g., myasthenia gravis scleroderma, thyroiditis)
Endocrine disorders (e.g., Cushing syndrome, hypothyroidism, hyperthyroidism, Addison disease)
Exposure to toxins (e.g., herbicides, insecticides, flame retardant ...Read the full article