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Cyclical migraine is a classic or nonclassic migraine that occurs in cycles of two weeks or longer separated by headache-free periods. The shorter and spontaneous duration of a migraine attack during any cycle was one hour and the maximum was 72 hours. In each of the patients, the average duration of the attacks was invariably six hours or longer. Therefore, some patients have had seven attacks of migraine a week. There should be no difficulty differentiating cluster headache from cyclical migraine: (1) cluster headaches are more often seen in men and cyclical migraine in women; (2) cyclical migraine is long lasting, with a duration of six hours to two days—cluster headaches usually last less than two hours; (3) cluster headache is invariably unilateral and does not shift from side to side during the same cyclecyclic migraine could be either bilateral or unilateral and shifts from side to side during the
Medina JL. Cyclical Migraine Headache-Reply. Arch Neurol. 1982;39(6):386. doi:10.1001/archneur.1982.00510180064025
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