Diagnostic criteria:
- At least 5 attacks fulfilling criteria B-D
- An untreated episode lasts 15-180 minutes and shows as severe or very severe unilateral orbital, supraorbital and/or temporal pain
- Headache matches either or both of the following:
- at least one of the following signs and symptoms, ipsilateral to headache:
- conjunctival injection and/or lacrimation
- nasal congestion and/or rhinorrhoea
- eyelid oedema
- forehead and facial sweating
- miosis and/or ptosis
- a sense of restlessness or agitation
- at least one of the following signs and symptoms, ipsilateral to headache:
- Headache frequency between one every other day and 8 per day
- Not better accounted for by another ICHD-3 diagnosis
| Study | Reliability | Sn | Sp | LR+ | LR- |
| International Classification of Headache Disorder 3rd edition (ICHD-3) | NA | NA | NA | NA | NA |