Three normal children with headache occurring only with exertion were advised to try "head cooling" (eg, immersion of the head in cold water, cold water poured over the head, application of a cold, wet towel or ice pack) at the onset of headache. The patients were followed up quarterly as outpatients, and the effectiveness of head cooling in terms of the frequency of headaches, intensity (interference with play), duration, and side effects was assessed over 18 months.