Cluster headaches, although uncommon, are one of the more severe forms of head pain. They occur more commonly in men and are characterized by severe and constant pain deep in and around the eye on the affected side. The pain is generally intense and nonthrobbing, and often radiates into the forehead, temple, and cheek. The pain may leave as rapidly as it began or fade away gradually. Almost always the same eye is affected. The exact cause of cluster headaches is unknown.
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