Cluster Headache

Cluster headache is a neurological disorder characterized by episodes of severe headaches on one side of the head, typically around the eye and temple, lasting between 15 minutes and three hours. Episodes are often accompanied by eye watering, nasal congestion, drooping eyelids, or swelling around the eye on the affected side. Cluster headaches are unique in their periodicity and regularity, occurring at around the same hour every day during a cluster period that typically lasts eight to ten weeks a year, with pain-free intervals between cluster periods lasting a little less than one year, though some patients can have chronic cluster headaches without remission periods. The disease is considered among the most painful conditions known to medical science.