Etiology of Nasal Polyps

Nasal polyps form by extreme irritation of the nasal septum. Here are 2 reasons they form:
[1] Plant Allergies: When exposed to very high levels of pollen; especially when mowing grass, those allergic to the pollen may feel a strong burning in their nose. Within minutes, a nasal polyp developes.
[2] Chemical Allergies: When in an environment containing chemical atmospheres; such as an industrial city, a burning sensation may be felt before the nasal polyp quickly grows.