Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Myopathy ?
    ### Response:
    The myopathies are neuromuscular disorders in which the primary symptom is muscle weakness due to dysfunction of muscle fiber. Other symptoms of myopathy can include include muscle cramps, stiffness, and spasm. Myopathies can be inherited (such as the muscular dystrophies) or acquired (such as common muscle cramps).
    