Attacks of paroxysmal hemicrania occurring in periods lasting from seven days to one year, separated by pain-free periods lasting at least one month.
A. Attacks fulfilling criteria for 3.2 Paroxysmal hemicrania and occurring in bouts
B. At least two bouts lasting from 7 days to 1 year (when untreated) and separated by pain-free remission periods of ≥1 month.