Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Bell's Palsy ?
    ### Response:
    Bell's palsy is a form of temporary facial paralysis resulting from damage or trauma to the 7th cranial nerve, one of the facial nerves. It is the most common cause of facial paralysis. Generally, Bell's palsy affects only one side of the face, however, in rare cases, it can affect both sides.
    