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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 |