Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Hyperkalemic periodic paralysis ?
    ### Response:
    Hyperkalemic periodic paralysis is a genetic condition that causes episodes of extreme muscle weakness, 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 about age 25, after which they may occur less frequently.
    