Food allergies are the most likely allergies to cause nausea and/or vomiting. A reaction occurs when your immune system overreacts to a food or a substance in a food, incorrectly identifying it as a danger and triggering a protective response. If you encounter something you are allergic to, your immune system considers the substance dangerous and releases a chemical called Histamine to counteract it. Histamine can cause a variety of symptoms, including rash, headache, sneezing, runny nose and swelling and in the case of food allergies, nausea, vomiting and diarrhea. If you eat the allergen, you are more likely to have symptoms in your mouth, stomach and intestines.
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