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Cluster Headache Causes



Precisely what causes cluster headaches is unknown, but the condition has several well-recognized triggers, including alcohol, particularly if a person is going through a cluster period, and nitroglycerine or similar drugs. The fact that some of these triggers also cause blood vessels to dilate or open up to increase blood flow, or involve medications which make blood vessels constrict or narrow to reduce blood flow, suggests that changes in the vascular struc...Read the full article