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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.
Onions emit a chemical that is an irritant to your eyes and nose. If cutting them can cause tears to form in your eyes and make your nose run, maybe they work to ward off colds and flu by washing the germs out of your eyes and nose before they can make you sick.What a stinky way to do that though.E: onions. by: Anonymous. i can see how eating onions, or even wearing them in your socks could improve your immune system, but we tried the onion in the room, and saw no difference. tried it in my son's room (various changes of onion. peeled and cut in half) and he was sick several times that winter.