Q: What is an allergen? Can you name a few allergens?

A: Allergens are materials, which, after accumulating to the nasal mucosa or respiratory mucosa, cause overreaction of body’s immunosystem and lead to allergic symptoms. 
The most common allergen is tree or grass pollens. Outdoor allergens include grass and mold. Indoor allergens include dust mites, molds, pet dander and
 cockroach related particles. Other substances such as paint vapor, fiber dust, cigarette smoke, perfumes and aerosol sprays can also cause allergic reaction. 


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