I get headaches after eating anything with chives in it. Could this be an allergic reaction?

could be…especially if you are also getting any rashes, skin flushing, shortness of breath, nausea, or vomiting.

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Yes it could be the chives, and it could be an allergic reaction. Do you react this way with any other type of onion? It could be the preservative used to keep the chives fresh. That’s what it sounds like to me.

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Yes. Don’t eat them.