Starting as a serendipitous side effect in 1967, the mystery of the efficacy of some beta-blockers in the prevention of migraine has not dimmed.

As migraine research carries on as a highly-scattered and increasingly multi-pronged process, it is important to underscore what we know, what we do not know, and what we might have missed by an exclusive pathophysiologic hyperfocus on the brain with varied hypotheses and postulations in terms of pharmacologic beta-blockade (and several other theories, including cortical spreading depression [CSD] ).

There is an intellectual cost for every assumption -- a feature that migraine researchers, have, in general, ignored.

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