why do human being sneeze?

Answer 1

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 and mouth that removes offending material from the nasal passages.

Causes & Symptoms

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-.

Answer 2

Sneezing is generally caused by irritation and some times bacterial clog up in the throat, lungs or in the passages of the nose. Allergens such as pollens, pet dander, house dust mites, as well as nonallergenic particles are usually harmless, but when they irritate the nose the body responds by expelling them from the nasal passages. The nose mistakes strong odors, sudden chills, bright lights (see photic sneeze reflex), and even orgasms in some people for nasal irritants, and it tries to defend itself with a sneeze.

Answer 3

Sneezing is a way that your body gets rid of bad things that are in your nose. These things might be bacteria, germs, and other things. You also sneeze when you smell pepper because your body does not like pepper!