At birth'' None as systemic causes; mainly hereditary Onset in childhood Inflammatory myopathies – dermatomyositis, polymyositis (rarely) Infectious myopathies Endocrine and metabolic disorders – hypokalemia, hypocalcemia, hypercalcemia Onset in adulthood Inflammatory myopathies – polymyositis, dermatomyositis, inclusion body myositis, viral (HIV) Infectious myopathies Endocrine myopathies – thyroid, parathyroid, adrenal, pituitary disorders Toxic myopathies – alcohol, corticosteroids, narcotics, colchicines, chloroquine Critical illness myopathy Metabolic myopathies Paraneoplastic myopathy Treatments Because different types of myopathies are caused by many different pathways, there is no single treatment for myopathy. Treatments range from treatment of the symptoms to very specific cause-targeting treatments. Drug therapy, physical therapy, bracing for support, surgery, and massage are all current treatments for a variety of myopathies. References External links GeneReviews/NCBI/NIH/UW entry on Myopathy with Deficiency of ISCU See http://neuromuscular.wustl.edu/ for medical descriptions. Muscular disorders