Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Glossopharyngeal Neuralgia ?
    ### Response:
    Glossopharyngeal neuralgia (GN) is a rare pain syndrome that affects the glossopharyngeal nerve (the ninth cranial nerve that lies deep within the neck) and causes sharp, stabbing pulses of pain in the back of the throat and tongue, the tonsils, and the middle ear.
    