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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.
Onion Allergy Symptoms. Allergic reactions to onions can be internal or external. External reactions usually result from direct contact or smelling onions, while internal reactions come from ingesting onions. An individuals response or allergic reaction may show up at different times and at varying degrees.