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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).
Both hypothyroidism and hyperthyroidism are known to cause what are called myopathies -- the medical term for diseases that affect skeletal muscle. Skeletal muscles are the muscles connected to your bones. An example of a skeletal muscle is your biceps in the upper arm, or the quadriceps in the thigh.