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Why would have a headache after allergic reaction?
1 doctor weighed in

In brief: 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.

In brief: 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.
Dr. Michael H. T. Sia
Dr. Michael H. T. Sia
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