Allergic Reactions to Tree Nuts. Tree nuts can cause a severe and potentially life-threatening allergic reaction anaphylaxis . If you have a tree nut allergy, keep an epinephrine auto-injector such as an EpiPen, Auvi-Q or Adrenaclick with you at all times. Epinephrine is the first-line treatment for anaphylaxis..Allergic Reactions to Peanuts. Peanuts can cause a severe, potentially life-threatening allergic reaction anaphylaxis . Allergic reactions can be unpredictable, and even very small amounts of peanut can cause one. Epinephrine is the first-line treatment for anaphylaxis..More than 170 foods have been reported to cause allergic reactions. Eight major food allergens - milk, egg, peanut, tree nuts, wheat, soy, fish and crustacean s.fish - are responsible for most of the serious food allergy reactions in the United States..Learn the basics of food allergies, their symptoms and how they are diagnosed. the majority of allergic reactionsincluding peanut, milk and eggplus how .