What is the definition of perennial allergy?

A perennial allergy is an allergic reaction that occurs throughout the year, rather than being seasonal. Perennial allergies are typically caused by allergens that are present in the environment year-round, such as dust mites, pet dander, mold, and certain foods. Perennial allergies can cause a variety of symptoms, including sneezing, runny nose, itchy eyes, and congestion. Treatment for perennial allergies typically involves avoiding the allergens that trigger them, as well as taking medication to relieve symptoms.