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Some people will suffer a mild form of an allergic reaction and have minor symptoms including such things as hives. Those with a more serious reaction to onions may even have problems just breathing in the smell of onions without having an allergic reaction that can compromise their health.
Report This| Share this:Food Allergy: Red onions = HeadacheActually, I have the same exact symptoms you describe. I just noticed it recently. After eating raw red onions in a salad, I feel intense pressure behind my eyes and fairly moderate headaches. Kinda sucks too, because I actually like red onions.