Table 1 Diagnostic criteria for cluster headache

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)

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 rhinorrhea

• Eyelid edema

• 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 day

E. Not better accounted for by another ICHD-3 diagnosis