What is the cause of perennial allergic rhinitis (hay fever)?

Updated: Dec 26, 2018
  • Author: Javed Sheikh, MD; Chief Editor: Michael A Kaliner, MD  more...
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Answer

Perennial allergic rhinitis is typically caused by allergens within the home but can also be caused by outdoor allergens that are present year-round. [47] In warmer climates, grass pollens can be present throughout the year. In some climates, individuals may be symptomatic due to trees and grasses in the warmer months and molds and weeds in the winter.


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