What triggers allergic reactions?
Allergies are triggered by substances called allergens. Each year, millions of people suffer from seasonal allergy symptoms such as nose and sinus congestion, itchy, watery eyes and runny nose. However, many also suffer from perennial allergies, which result in symptoms throughout the year. Perennial allergies are triggered by indoor allergens, including house dust mite droppings, animal dander, cockroach droppings and indoor molds.
