TABLE 1.

Causes of noninfectious myositis or myopathic symptoms

Myopathy-related disease or manifestation
Idiopathic inflammatory myopathies
Polymyolitis
Dermatomyositis
Inclusion body myositis
Myositis associated with collagen vascular diseases
Polyarteritis nodosum
Wegener's granulomatosis
Systemic lupus erythematosus
Rheumatoid arthritis
Scleroderma
Sjogren's syndrome
Leukocytoclastic vasculitis
Hypersensitivity vasculitis
Polymyalgia rheumatica
Mixed connective tissue disease
Adult Still's disease
Myositis associated with malignancies
Other forms of myopathies
Inflammatory myopathies
Myositis associated with eosinophilia
Myositis ossificans
Giant cell myositis
Myopathies due to drugs and toxins
Diseases causing myopathic signs and symptoms
Metabolic myopathies
Inborn errors of metabolism
Disorders in glycogen metabolism
Lipid storage disorders
Mitochondrial myopathies
Endocrine disorders
Hypo- and hyperthyroidism
Acromegaly
Addison's disease
Cushing syndrome
Hyperaldosteronism
Hyperparathyroidism
Electrolyte abnormality
Nutritional deficiency
Neuropathic disorders
Muscular dystrophies
Others, including diseases of the neuromuscular junction
Medication-related adverse events
Other causes
Sarcoidosis
Amyloidosis
Behcet's disease
Atherosclerotic emboli