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Table 13

From: Reference programme: diagnosis and treatment of headache disorders and facial pain. Danish Headache Society, 3rd edition, 2020

3.1 [G44.0/N90] Cluster headache [2]
 A. At least five attacks fulfilling criteria B-D
 B. Severe or very severe unilateral orbital, supraorbital and/or temporal pain lasting 15–180 min (when untreated)1
 C. Either or both of the following:
  1. at least one of the following symptoms or signs, ipsilateral to the headache:
   - Conjunctival injection and/or lacrimation
   - Nasal congestion and/or rhinorrhoea
   - Eyelid oedema
   - Forehead and facial sweating
   - miosis and/or ptosis
  2. a sense of restlessness or agitation
 D. Occurring with a frequency between one every other day and 8 per day2
 E. Not better accounted for by another ICHD-3 diagnosis
3.1. [G43.01/N89] Episodic cluster headache
 A. Attacks fulfilling criteria 3.1 and occurring in bouts (cluster periods)
 B. At least two bouts lasting from 7 days to 1 year (when untreated) and separated by pain-free remission periods of ≥3 months
3.1.2 [G43.02/N89] Chronic cluster headache
 A. Attacks fulfilling criteria 3.1 and occurring in bouts (cluster periods)
 B. Occurring without a remission period, or with remission lasting < 3 months, for at least 1 year
  1. 1: During part, but less than half, of the active time-course, attacks may be less severe and/or shorter or longer duration
  2. 2: During part, but less than half, of the active time-course, attacks may be less frequent