Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) familial hemiplegic migraine ?
    ### Response:
    Familial hemiplegic migraine is a form of migraine headache that runs in families. Migraines usually cause intense, throbbing pain in one area of the head, often accompanied by nausea, vomiting, and extreme sensitivity to light and sound. These recurrent headaches typically begin in childhood or adolescence and can be triggered by certain foods, emotional stress, and minor head trauma.
    