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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.
Some of the common triggers of an allergic reaction include: 1  Foods such as peanuts, shrimp, wheat, soy, eggs, nuts and dairy products. 2  Food allergies differ from food intolerances. 3  Food intolerances occur as a response of the digestive system, while food allergies occur as a response of the immune system.