Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) SUNCT Headache ?
    ### Response:
    SUNCT-Short-lasting, Unilateral, Neuralgiform headache attacks with Conjunctival injection and Tearing-is a rare form of headache that is most common in men after age 50. The disorder is marked by bursts of moderate to severe burning, piercing, or throbbing pain, usually on one side of the head and around the eye or temple.
    