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."
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:
- ipsilateral conjunctival injection and/or lacrimation
- ipsilateral nasal congestion and/or rhinorrhoea
- ipsilateral eyelid oedema
- ipsilateral forehead and facial sweating
- ipsilateral miosis and/or ptosis
- a sense of restlessness or agitation
D. Attacks have a frequency from one every other day to 8 per day
E. Not attributed to another disorder
- Anonymous (2015), Cluster headache (English). Medical Subject Headings. U.S. National Library of Medicine.
- International Headache Society. Cluster headache
- Francis GJ, Becker WJ, Pringsheim TM (2010). "Acute and preventive pharmacologic treatment of cluster headache.". Neurology 75 (5): 463-73. DOI:10.1212/WNL.0b013e3181eb58c8. PMID 20679639. Research Blogging.