Allergic rhinitis causes symptoms that affect the nose. It develops when the body’s immune system overreacts to something in the environment, such as dust mites or pollen from plants or trees.
Allergic rhinitis can either be seasonal or can last year-round.
- Seasonal allergic rhinitis usually happens in the spring, summer or early fall. It is usually caused by an allergy to mold, pollen or spores from trees, weeds or grass.
- Year-round allergic rhinitis is usually caused by an allergy to dust mites, pet hair or mold.