Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) neurohypophyseal diabetes insipidus ?
    ### Response:
    Neurohypophyseal diabetes insipidus is a disorder of water balance. The body normally balances fluid intake with the excretion of fluid in urine. However, people with neurohypophyseal diabetes insipidus produce too much urine (polyuria), which causes them to be excessively thirsty (polydipsia).
    