URMC / Encyclopedia / Content Search Encyclopedia Allergens: Triggers of Allergy Attacks Many allergies require clinical care by a physician or other health care professional. Listed in the directory below are some of the allergens that cause allergic reactions, for which we have provided a brief overview. Animals Chemical Sensitivity Dust and Dust Mites Foods Egg Allergy Diet Diet for Lactose Intolerance Milk Allergy Diet Peanut Allergy Diet Shellfish Allergy Diet Soy Allergy Diet Tree Nut Allergy Diet Wheat Allergy Diet Insect Stings Latex Pollen Poison Ivy / Poison Oak