Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Thyrotoxic Myopathy ?
    ### Response:
    Thyrotoxic myopathy is a neuromuscular disorder that may accompany hyperthyroidism (Graves' disease, caused by overproduction of the thyroid hormone thyroxine). Symptoms may include muscle weakness, myalgias (muscle tenderness), wasting of the pelvic girdle and shoulder muscles, fatigue, and/or heat intolerance.
    