Cluster headache

In medicine, a cluster headache is "a primary headache disorder that is characterized by severe, strictly unilateral pain which is orbital, supraorbital, temporal or in any combination of these sites, lasting 15-180 min. occurring 1 to 8 times a day. The attacks are associated with one or more of the following, all of which are ipsilateral: conjunctival injection, lacrimation, nasal congestion, rhinorrhea, facial sweating, eyelid edema, and miosis."

Diagnosis
Diagnostic criteria developed by the International Headache Society are: A. At least 5 attacks fulfilling criteria B-D B. Severe or very severe unilateral orbital, supraorbital and/or temporal pain lasting 15-180 minutes if untreated1 C. Headache is accompanied by at least one of the following: D. Attacks have a frequency from one every other day to 8 per day E. Not attributed to another disorder
 * 1) ipsilateral conjunctival injection and/or lacrimation
 * 2) ipsilateral nasal congestion and/or rhinorrhoea
 * 3) ipsilateral eyelid oedema
 * 4) ipsilateral forehead and facial sweating
 * 5) ipsilateral miosis and/or ptosis
 * 6) a sense of restlessness or agitation

Treatment
Treatment options have been reviewed in a meta-analysis.