Reasons Why Your Head Hurts

Cluster Headaches

A cluster headache describes pain in one side of the head. These headaches also can cause tearing eyes and a stuffy nose. Attacks occur off and on for up to a year and are separated by long pain-free periods that last at least a month.

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Review Date: 
March 20, 2014

Citation: 
Last Updated:
July 1, 2014