Allergens act as “triggers” causing people to experience symptoms. Allergens are found indoors, outdoors and in things we eat. Insect stings can also cause an allergy. Contact with plants and latex can also cause a reaction. Medications are also known to cause allergic reactions.
Pollens from trees, grasses and weeds and mold spores are common outdoor allergens. Maple, oak, elm, beech, birch, poplar, and ash trees are the primary trees whose pollen causes springtime allergies. Grass pollen and ragweed are the most common late spring and summer allergens. Indoor allergens are experienced year-round and are comprised of animal dander, dust mites and indoor molds. Stings from bees and fire ants can cause allergic symptoms. Poison ivy, oak and sumac are common plants known to cause an allergic reaction in most people. Common foods that cause allergies are peanuts, tree nuts, milk, egg, soy, wheat, fish and shellfish, although other foods can also cause allergies.