What is the real cause of sneezing

dust gets into the nose and irratates everything inside.
so the only way to get all the dust out is to sneeze.


(((SOMETHINGLIKETHAT))))

http://wrongdiagnosis.com/symptoms/sneezing/causes.htm

Sneezing, also known as sternutation, is the response of the mucous membrane of the nose to an irritant or foreign body that causes allergy in a hypersensitive person. A sneeze is an involuntary explosive burst of air from the nose & mouth that removes offending material from the nasal passages.

Sneezing can occur from a number of causes, or may itself be a symptom of an underlying condition, most likely an allergy or common cold. Sneezing may simply be triggered by a small foreign object or substance in the nose, including particles of pepper, smoke, irritating chemical fumes, or gases. It may also be a symptom of a common cold, upper respiratory tract infection, hay fever, or other allergies to pollen, dust, dust mites, mold, dander, grass, or other substances. Additional potential causes of sneezing include withdrawal from opiate drugs, inhaling corticosteroids, whooping cough, or anaphylaxis. Many people sneeze when they step outdoors into bright sunlight. Others report sneezing whenever they tweeze their eyebrows.-