Cluster headache is a severe pain that happens in a recurrent and cluster attack. Each episode may last about 10s minutes to several hours. Headache usually occur on one side of the brain and around one eye accompanied with the red eye, tearing and watery nose. It may occur at the same time every day, lasting for weeks or months. The remission period when the headache stops, can be month or years.
Cluster headache occur more in adult men. Smoking and alcoholism may increase the risk of the headache.