Chronic migraine can be diagnosed using criteria of the International Headache Society (IHS).

Patient selection: headache


Features of chronic migraine:

(1) history of migraine headaches

(2) average migraine frequency >= 15 days per month for >= 3 months

(3) all of the following:

(3a) attacks meet criteria for migraine without aura

(3b) no use of symptomatic drugs

(3c) not attributable to another disorder

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