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Table 1 Diagnostic criteria for cluster headache according to the ICHD-2 [2]

From: Neurobiology and sleep disorders in cluster headache

Cluster headache

 A. At least 5 attacks fulfilling criteria B-D

 B. Severe or very severe unilateral orbital, supraorbital and/or temporal pain lasting 15–180 min 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 rhinorrhoea

  3. Ipsilateral eyelid oedema

  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 8 per day

 E. Not attributed to another disorder

Episodic cluster headache

 A. Diagnostic criteria A-E for cluster headache

 B. At least two cluster periods lasting 7–365 days and separated by pain-free remission periods of ≥ 1 month

Chronic cluster headache

 A. Diagnostic criteria A-E for cluster headache

 B. Attacks recur over > 1 year without remission periods or with remission periods lasting < 1 month.