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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.
The onion allergy reacts very quickly. It can start within a minute after eating onions. The reaction can be very severe and life threatening. But with onion intolerance, it may take up to a day for the symptoms to appear and the reaction is mild . Some people canât tolerate the sulphur and chemical that onion has.