Abstract
Cluster headache is a primary headache disorder characterized by attacks of severe-to-very severe unilateral pain, located in the orbital, supraorbital, and/or temporal regions, with ipsilateral autonomic symptoms and/or restlessness. By definition, cluster headache attacks last between 15 and 180 minutes. Based on the temporal course, cluster headache can be categorized into episodic and chronic. A subdivision can also be made in primary and secondary chronic and secondary episodic. The cause of cluster headache is unknown, but probably the hypothalamus, trigeminal sensory system, some cranial blood vessels, and the autonomic nervous system are involved. A combination of acute (oxygen inhalation and/or subcutaneous sumatriptan) and prophylactic (first choice verapamil) treatment is usually necessary. For treatment-resistant patients, some experimental invasive options exist.
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