Table 1

Diagnostic criteria for cluster headache according to the International Classification of Headache Diseases II

3.1 Cluster headache
A. At least five attacks fulfilling B through D
B. Severe or very severe unilateral orbital, supraorbital and/or temporal pain lasting 15 to 180 minutes if untreated
C. Headache is accompanied by at least one of the following:
     1. Ipsilateral conjunctival injection and/or lacrimation
     2. Ipsilateral nasal congestion and/or rhinorrhea
     3. Ipsilateral eyelid edema
     4. Ipsilateral forehead and facial sweating
     5. Ipsilateral miosis and/or ptosis
     6. A sense of restlessness or agitation
D. Attacks have a frequency from one every other day to eight per day
E. Not attributed to another disorder

Leroux and Ducros Orphanet Journal of Rare Diseases 2008 3:20   doi:10.1186/1750-1172-3-20