Table 1 Diagnostic criteria for paroxysmal hemicrania (ICHD-II)

A. At least 20 attacks fulfilling criteria B–D

B. Attacks of severe unilateral supra-/orbital temporal pain lasting 2–30 min

C. Headache is accompanied by at leats 1 of the following:

 1. Ipsilateral conjunctival injection and/or lachrymation

 2. Ipsilateral nasal congestion and/or rhinorrhea

 3. Ipsilateral eyelid oedema

 4. Ipsilateral forehead and facial sweating

 5. Ipsilateral miosis/ptosis

D. Attacks with a frequency of >5/day for more than half the time

E. Attacks completely prevented by therapeutic doses of indomethacin (mg kg⁻¹ day⁻¹)

F. Not attributed to another disorder