Why do we sneez?

Answer 1

A sternutation or, more commonly known, sneeze is a semi-autonomous, convulsive expulsion of air from the nose and mouth. This air can reach speeds of 100-200 mph and an unimpeded sneeze sends two to five thousand bacteria-filled droplets into the air.

Sneezing is generally caused by irritation 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.

It is almost impossible for one to keep one's eyelids open during a sneeze, although some rare individuals report having little if any trouble doing so. The reflex of shutting the eyes serves no obvious purpose: the nerves serving the eyes and the nose are closely related, and stimuli to the one often trigger some response in the other. The closing of the eyes may be to protect the tear ducts and blood vessels from bacteria expelled in the sneeze.
Beliefs about sneezing


In 400 BC the Athenian general Xenophon gave a dramatic oration exhorting his fellow soldiers to follow him to liberty or to death against the Persians. He spoke for an hour motivating his army and assuring them a safe return to Athens until a soldier underscored his conclusion with a sneeze. Thinking this sneeze a favorable sign from the gods, the soldiers bowed before Xenophon and followed his command. Another divine moment of sneezing for the Greeks occurs in the story of Odysseus. Odysseus returns home disguised as a beggar and talks with his waiting lover Penelope. She says to Odysseus, not knowing to whom she speaks, that he will return safely to challenge her suitors. At that moment their son sneezes loudly and Penelope laughs with joy, reassured that it is a sign from the gods.[1]

Among the pagans of Flanders, a sneeze was an omen. When Saint Eligius warned the pagans against their druidical practices, according to his companion and biographer Ouen, he included the following: "Do not observe auguries or violent sneezing or pay attention to any little birds singing along the road. If you are distracted on the road or at any other work, make the sign of the cross and say your Sunday prayers with faith and devotion and nothing inimical can hurt you."

In Hungary and Slovenia, a sneeze that occurs after making a statement is sometimes interpreted as a confirmation by God that the statement was true.

It is a common belief in India that someone who sneezes remembers or is remembered by someone dear to him or her. Most Indians consider sneezing healthy, and the inability to sneeze to be cause for alarm. Psychology Today reports that Indian scientists have labeled an inability to sneeze "asneezia"; the people of India have long used snuff as a way to artificially induce sneezing.

According to an old Japanese belief, sneezing twice in a row is a sign that someone is talking about you.

Answer 2

Sneazing is a reflex(involuntary)action meant to clear nose of any unwanted material like excessive secretion,foreign body etc.It is a protective measure.

Answer 3

To clean dust out of the nose canal.

Answer 4

Because we live.