Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Sudden sensorineural hearing loss ?
    ### Response:
    Sudden sensorineural deafness is a condition that is characterized by rapid, unexplained hearing loss. More specifically, affected people experience a reduction in hearing of greater than 30 decibels, which may occur all at once or over several days. In most cases, only one ear is affected.
    