When a person has indoor or home allergies, the body's immune system mistakenly reacts to substances, such as dust, mold, animal dander, or animal saliva, as invaders. These substances are called allergens. They do not cause allergy symptoms for most people, but in people with one of these allergies, an allergic reaction occurs as the immune system tries to fight off the allergen. Read more in this patient education guide.
Common indoor or home allergens include:
Allergens enter the body through the eyes, airways, or on the skin, leading to symptoms such as:
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