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Cluster headache (one-sided headache behind the eye)

Severe headaches characterized by pain on one side of the head, or around one eye. They often recur at the same time each day, and can last for several days or weeks, with weeks or months of remission. 90% of those affected are males. Some people who have cluster headaches are heavy smokers. Alcohol use, bright light, stress, or certain foods may trigger an attack.
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