Muscle weakness and wasting may be caused by a variety of conditions both systemic and those confined to the muscles only.

Causes

Localised

  • ●

    Peripheral nerve lesions

    • ●

      Peripheral nerve compression

    • ●

      Motor neuropathy

    • ●

      Peripheral nerve transection

  • ●

    Disuse atrophy

  • ●

    Anterior horn cell lesions

    • ●

      Previous poliomyelitis • (common in developing countries)

Generalised

Nutritional deficiency

  • ●

    Vitamin D deficiency

Systemic disease

  • ●

    Malignancy

  • ●

    Cardiac and/or respiratory cachexia

  • ●

    Thyrotoxicosis

  • ●

    Sarcoidosis

  • ●

    Guillain–Barré syndrome

  • ●

    Cushing’s disease

  • ●

    Addison’s disease

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