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Myopathy is a disease of muscle in which the muscle fibers do not function properly. This results in muscular weakness. Myopathy simply means muscle disease (Greek myo- muscle + patheia < -pathy suffering). This meaning implies that the primary defect is within the muscle, as opposed to the nerves (neuropathies or neurogenic disorders) or elsewhere (e.g., the brain).
Physical therapy can be used to lessen symptoms. Myopathy. Myopathy is a disease that causes the skeletal or voluntary muscles to become weak or wasted. Myopathies sometimes occur as a reslut of drug side effects, chemical poisoning, or a chronic disorder of the immune system.