ANSWER: This headache is characterized by sudden and severe piercing pain on one side of the head. These headaches come in clusters -- appearing during several consecutive days, weeks, or months, and then disappearing, only to come back months or years later. Cluster headaches can come and go five or six times during a day. They're usually short-lived, lasting from 30 minutes to two or three hours each time.
With a cluster headache you may have a droopy-looking eyelid or sweating on the side the hurts, and you may find that moving around makes you feel better. Typically, cluster headaches aren't accompanied by nausea or vomiting. Pain comes from behind one eye. The eye may tear up or become red, and the nostril on this same side may run or feel congested.
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