Table 13

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