With rare exception immediate reactions occur in minutes to 4 hours after the 1st bite in food allergy.
Delayed reactions occur 10-24 hours after eating. Immediate reactions include lip & tongue, eyelid & face swelling, swollen throat (laryngospasm), hives, nausea, vomiting, hives, asthma a& anaphylaxis. Delayed reactions are eczema and diarrhea. Diarrhea may be intolerance rather than allergy.
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