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.

Reviewed by: 
Review Date: 
March 20, 2014

Last Updated:
July 1, 2014