frequency was more than once a week in 52%, once a week in 21%, and once a month in 27%. Intensity was severe in 30%, and mild in 40%. Localization was frontal in 69% and occipital in 23%; bilateral in 48% and alternating in 22%. Headache associated symptoms in 47% included photophobia (15%), nausea (7%), and vertigo (8%). A psychogenic precipitant was recognized in 22%. A history of periodic syndrome, mainly cyclic vomiting and recurrent abdominal pain, preceded the onset of headache illness

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... 47%. Family history of migraine was present in 58%. Only 14% of patients had other types of headache in addition; 10% had migraine and 4% tension headache. Neurologic exam, imaging in 32 patients, and EEG in 67 were normal. At 1 to 5 year followup, 70% were free of symptoms. (Soriani S, Battistella PA, Arnaldi C et al.