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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.
If you present with an allergy to onions and garlic, however, you might have to ditch these ingredients instead of dishing them out. Otherwise, if you consume food with either of these ingredients, then your hypersensitivity to them would trigger an allergic reaction.