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The most common cause of peanut allergy is eating peanuts or peanut-containing foods. Sometimes direct skin contact with peanuts can trigger an allergic reaction. Cross-contact. This is the unintended introduction of peanuts into a product. It's generally the result of a food being exposed to peanuts during processing or handling. Inhalation.
Peanut allergy signs and symptoms can include: 1  Runny nose. 2  Skin reactions, such as hives, redness or swelling. 3  Itching or tingling in or around the mouth and throat. 4  Digestive problems, such as diarrhea, stomach cramps, nausea or vomiting. 5  Tightening of the throat. 6  Shortness of breath or wheezing.