They are regular things around us (airborne substances) that do not cause allergic symptoms normally. However, if people are susceptible to allergy, their bodies will overreact when they exposed to the allergen. They are classified as indoor and outdoor allergens.
Indoor Allergens:
We usually find them inside the house. They include:
Dust mites: Dust mites are insects, not able to be seen with the naked eye, that survive in bedding, carpets, stuffed furniture, old clothing and stuffed toys. They survive primarily on human dander. Dust mites are common in humid climates.
Mold spores: These are part of a fungus. They can be found in a lot of homes. Mold chooses to grow in humid places like bathrooms or kitchens.
Cockroach’s particles: Cockroaches can live in small cracks in homes without ever being seen. You will more likely to find them in the kitchen where food is exposed.
Animal dander and feathers: This is the bits of dead skin or hairs that naturally fall off any animal.
Outdoors Allergens:
They present outside. The commonest one is pollen from trees, shrubs, grasses and weeds. Pollen may travel many miles. Therefore trees, grasses and weeds in your general area can cause allergy symptoms.
