Below is an instruction from Human. Write a response.
    ### Instruction:
    What causes Cramp-fasciculation syndrome ?
    ### Response:
    What causes cramp-fasciculation syndrome? In many cases, the exact underlying cause of cramp-fasciculation syndrome (CFS) is unknown (idiopathic). In general, it is thought to be related to abnormal excitability (overactivity) of peripheral neurons. Some ca
    