Allergy Information People have allergic reactions to peanuts and tree nuts because their body finds the protein in the peanuts/tree nuts to be harmful. The immune system generates antibodies that dispense chemicals into the blood system, which cause the symptoms of an allergic reaction. Reaction Regardless of the amount of exposure, reaction to peanuts and tree nuts can be severe. Vomiting, diarrhea, wheezing, hives, itching, and swelling of the skin, eyes, nose, mouth and throat can occur as a result of the allergic reaction. Reduce Contact It's important that people who are allergic to peanuts and tree nuts avoid peanuts, pistachios, pecans, almonds, cashews, walnuts, Brazil nuts, hazelnuts and macadamias. There should be limited access to nuts in and around the home, and unfamiliar foods should not be eaten unless they are cooked at home without the contamination of nuts. Gain Awareness Inform yourself and your loved ones on foods that contain or may contain peanuts or tree nuts. Always ask for a list of ingredients when eating outside of the home. If you feel like you may have consumed a food that contains nuts, seek a physician's help immediately. Be Prepared Create an allergy emergency plan for you, your spouse or your children. Introduce it to day cares, schools, babysitters, places of work and family members. Keep epinephrine (a hormone that prepares the body for an emergency situation) in your possession 24/7.