Allergens and Irritants: What's the Difference?

Allergens and irritants both trigger the same kinds of symptoms — but in
different ways.

An allergen works inside the body. It sets off a chemical chain reaction by the body's immune system. This chain reaction releases chemicals, called histamines, from special cells in the body, called mast cells. Histamines are the major cause of allergy symptoms, such as congestion, itchy eyes, dripping nose, and sneezing.

Unlike allergens, irritants do not trigger the body's immune system. Medical specialists don't know exactly why irritants cause nasal symptoms, but it may have something to do with the sensitivity of the skin inside the nasal passages.^1,2 When exposed to an irritant, the nose “overreacts” with the same types of symptoms mentioned above.

If you're bothered by allergens, you're likely to be bothered by irritants, as well. Most people are, and many don't realize it. If your symptoms occur at certain times of the year, then you probably have seasonal allergies. If your symptoms occur year-round, then you might be sensitive to environmental triggers.

Only your doctor can tell you for sure, and prescribe the right treatment for you. Ask your doctor about the dual relief that ASTELIN provides, and if treatment with ASTELIN may be right for you.

Common Allergens

Common Irritants

Pollen Check