(HealthDay News) -- Cluster headaches are bouts of severe, recurring pain on one side of the head. They may strike in clusters, occurring daily or several times a day for weeks at a time. The exact cause of cluster headaches isn't understood.
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The University of Virginia Health System says risk factors for cluster headaches are thought to include:
- Drinking alcohol.
- Changes in barometric pressure.
- Sleep schedule changes.
- Using tobacco.
- Taking certain medications, including nitroglycerin.
-- Diana Kohnle
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