Cluster headache (CH) is a relatively uncommon type of headache. The episode lasts 15 minutes to three hours and occurs on a daily or nearly daily basis for weeks or months. Cluster headache appears to be caused by the body's abrupt release of histamine (a chemical in the body released during an allergic reaction) or serotonin (a chemical produced by nerve cells) in the area of the trigeminal nerve in the face. A issue may be present in the hypothalamus, a small area at the base of the brain. Alcohol and cigarette smoking can cause cluster headaches, as can high altitudes, strong lights, exertion, heat, foods high in nitrite, some narcotics, and cocaine.
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