What Causes Year-Round Allergies? Mold, Dust Mites & More


Allergic rhinitis is a type of allergic reaction. It happens when your immune system overreacts to something in your environment.

In other words, your body reacts to an environmental trigger that’s generally harmless as though it were a threat, such as a virus.

The symptoms of allergic rhinitis often mimic those of a cold. For example, they can include:

  • sneezing
  • runny or stuffy nose
  • itchy or watery eyes
  • coughing
  • headache
  • fatigue

If you only experience allergic rhinitis during certain times of the year, you have “seasonal allergies” or “hay fever.” You’re probably allergic to outdoor triggers, such as pollen.

If you experience it year-round, you’re probably allergic to indoor triggers. Learn about the most common indoor triggers of year-round allergic rhinitis.

Pet dander

Dander is made up of tiny bits of dead skin that flake off of animals. It can be found in the air and on surfaces that come into contact with pets.

Because of it being of light weight and microscopic and having rough edges, dander easily sticks to clothing, furniture, and carpet. As a result, it’s easy to spread around an environment, such as your home.

Some types of pet dander are more likely to trigger allergic reactions than others. For example, cat allergies are about twice as common as dog allergies, according to the American Lung Association.

Plus, not all dog breeds are created equal for people with allergies.

Some “hypoallergenic” dog breeds may be less likely to trigger an allergic reaction.

The American Kennel Club (AKC) lists dogs with coats that don’t shed, such as poodles and schnauzers, as safer options for people with allergies.