What Are Allergies?

Allergic reactions occur when the immune system encounters and overreacts to substances that are not genuinely harmful. These substances are called allergens.

In people who have nasal allergies, the immune system reacts to an airborne (inhaled) allergen by creating an antibody called immunoglobulin E, or IgE, that is designed to fight that specific allergen. This antibody-allergen complex attaches to certain cells in the nasal passages and causes the release of chemicals including histamine, which in turn cause inflammation.

The end result is nasal allergy symptoms—congestion, sneezing, and an itchy or runny nose. Some common examples of inhaled allergens are airborne pollens from some plants and trees, mold spores, and dog and cat dander.

Pollen Count (A Five Day Pollen Count Forecast for Cheshire, CT) is a website featuring allergy information, forecasts for your area, and the latest news in allergy research and treatment.

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