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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.
Different people react differently to the same allergens. Some people may just have an uncomfortable rash, while others may go into anaphylactic shock. In any case, signs and symptoms of a food allergy usually develop within a few minutes to an hour after having ingested the food. The most common signs and symptoms of a true food allergy include: 1  tingling in the mouth; 2  itching or eczema; 3  swelling, especially on the lips, face, throat, and neck; 4  wheezing, nasal congestion, and a general difficulty in breathing; 5  abdominal pain, nausea, and vomiting. 6  dizziness, light-headedness, and fainting.