Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) hyperkalemic periodic paralysis ?
    ### Response:
    Hyperkalemic periodic paralysis is a condition that causes episodes of extreme muscle weakness or paralysis, usually beginning in infancy or early childhood. Most often, these episodes involve a temporary inability to move muscles in the arms and legs. Episodes tend to increase in frequency until mid-adulthood, after which they occur less frequently.
    