Cluster headaches are characterized by sharp, severe pain around one eye that is abrupt and brief. There may be 1-3 episodes per day for 4-8 weeks. They are most common middle aged men. The cause is usually related to ingestion of specific foods, allergies or stress. It is believed that the headaches are brought on by dilation of the blood vessels around the painful area. Nasal congestion is often noted on the same side as the headaches. The pain can be agonizing and usually reaches maximum intensity very quickly.
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