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Why would have a headache after allergic reaction?

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Related...: Years of published data and clinical experience suggest that food allergy may be a trigger of recurrent, persistent migraine headaches in a few, but by no means all patients. In such cases, only a few foods trigger migraines and, by limiting or avoiding them, you can experience complete or marked relief without medication. Allergic rhinitis also can trigger headaches dilating blood vessels/brain.

Answered 6/18/2012

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