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We do not yet fully understand the pathogenesis of Migraine, however we do know that it involves spreading cortical depression. Migraine is neurological. Triggers lower your threshold for Migraine and should be avoided. There is also a neurochemical process involved in Migraine. There is sometimes vasodilation that may contribute to Migraine, but this is an old theory that was disproven when it was found that a Migraine can be present without vasodilation.

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