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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.
Treatment and Prevention: If you are allergic to onions, then avoid all foods which contain onions. The best option is to prevent it as it is not possible to cure onion allergy permanently. Stay in an environment where onions are not cultivated as to smell it or coming to its contact can start the reaction.