(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.

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.

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