Definition of Hay fever

1. 10 Common Allergy Triggers Slideshow Pictures
2. Take the Quiz on Allergies
3. Nasal Allergy Relief Slideshow Pictures

Hay fever: A seasonal allergy to airborne particles characterized by itchy eyes, runny nose, nasal congestion, sneezing, itchy throat, and excess mucus.

Hay fever is a misnomer because it is not caused by hay and it does not produce a fever. It is also known as allergic rhinitis or pollinosis.