Table 2

Diagnostic features of cluster headache modified from the International Headache Society2 with the proposed changes*

†No reasonable secondary cause.
Cluster headache has two key forms:

  •     Episodic: occurs in periods lasting 7 days to 1 year separated by pain-free periods lasting one month*

  •     Chronic: attacks occur for more than one year without remission or with remissions lasting less than one month*

†Headaches must have each of:

  •     Severe unilateral orbital, supraorbital, temporal pain lasting 15 minutes to 3 hours

  •     Frequency: 1 every second day to 8 per day

  •     Associated with 1 of:

        –lacrimation
        –nasal congestion
        –rhinorrhea
        –forehead/facial sweating
        –miosis
        –ptosis
        –eyelid oedema
        –conjunctival injection
        Or
        –sense of restlessness or agitation during headache*