06-04-2012, 02:53 PM
Commonly known as allergic rhinitis, hay fever is a type of allergic reaction that can cause inflammation in the nasal airways. It usually occurs when an allergen such as pollen or animal dander is taken in by an individual with a sensitized immune system. For this matter, the allergen triggers the IgE to produce massively thus result to the occurrence of the different symptoms of hay fever.