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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.
What Causes an Allergy to Onions? The onion allergy causes in the same way as other food allergies. When you consume raw onions or a food which contain onions, the immune system of the body reacts negatively to it. The immune system of the body infers that the protein of this vegetable will harm the body.