what causes a sneeze?
470593
A tickling of the nose hairs or there is something that shouldn't be in your body and mucus has caught it and blows it outs there!
190467
Sneezing is actually a reflex action to a stimuli.The nerves send the message to the brain and then you sneeze. During sleep the reflex part of your brain rests too. The irritant still annoys the nerves but  no message is sent to the brain. However if the stimuli builds the irritant to  a level registered as pain the brain will wake you and you will sneeze (but to have this part of your brain working  you need to be awake!!)Scientific Fact! :)
18663
You're simply blocking the air that would come out during the sneeze, not actually preventing the sneeze. You can accomplish the same thing by closing and tightening your mouth.
23007
Sneezing is defensive act by the nose to bring out any foreign body-ouside elements- outside.  So it should not be stopped.
370361
Probably because your face contorts (even if only slightly when the light source is mild), and that adds to the irritation in your nostril, triggering off a sneeze.
653552
do you mean sneeze?  or sinus?
670863
It's probably dust. You can clean all you want but dust is still in the air. When you clean your house you are cleaning the dust that has fallen out of the air and landed on furniture. You can't clean your air unless you have a special filter.\n\nDo you have any animals in the house? It could be an allergy to an animal.\n\nDoes it only happen in your house, or other indoor places?\n\nAs far as sneezing fits, that's how it effects some people. There isn't much you can do about it.
719072
When people sneeze, they tense up thus their muscles put a strain on their joints.  This is actually one of the reasons people in car accidents get broken bones.  Not because of the actual crash, but because of tensing their muscles which result in the muscles breaking the drivers own bones.  Also the fact that you pop a lot of your joints doesn't help.
454621
"Close association between the eye’s optic nerve and nerves causing the sneeze reflex may explain why an estimated 5-25% of people sneeze with sudden exposure to bright sunlight or other light sources.\n\nSudden bright stimulation of the eye that occurs after a person has become adapted to darker surroundings is thought to bring on the condition, known as photic sneeze reflex."
64314
Some people do find that bright light causes them to sneeze. It seems to be biological or hereditary. If you walk outside into the bright sun or look at a bright light you sneeze.\n\nIts called Photic Sneeze Reflex!!
309795
It is the strain of sneeze.
217632
Sounds like morning allergies. I used to have that when i lived in an apt that had bad ventillation and carpet. You have to vacuum frequently, wipe away dusty areas, open your windows in the morning. When i moved into my new apt that has wooden floors, I never had the sneezing problem again.
758125
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 70 m/s (250 km/h) and an unimpeded sneeze sends two to five thousand bacteria-filled droplets into the air\n\nThis was also interesting:\n\nFebruary 2002 - Your brain musters a host of muscles to clear irritants from your nose at speeds up to 100 mph.\n\nEver try to stop a sneeze? Not easy, is it?\n\nSneezing is a reflex. "When your nose itches you sneeze," just as your knee jerks when a doctor taps it, says California allergist William E. Berger, M.D., a member of the American College of Allergy, Asthma and Immunology. "Closing your eyes when you sneeze is also part of the reflex reaction."\n\nSneezing may seem simple, but it's more involved than you think. Here's how it works: Your nose often warns you a sneeze is coming. An irritant makes your nose start to itch or tickle.\n\nThen the part of your brain termed a "sneeze center" sends a message to designated muscles. "The signal from the brain tells our body to sneeze as a means of clearing out the irritating particles," says Dr. Berger.\n\nThe chest, abdomen, diaphragm, vocal cords, throat and eyelids join in a certain order to launch a sneeze. Presto -- your nose releases the irritant that's causing that itch. A sneeze propels particles from your nose at a speed of up to 100 miles per hour.\n\nSome particles sneak into your nose in a normal breath. A lot more come from colds or allergies. But the cause of your sneeze could also be bright sunshine.\n\nStrange as it sounds, bright light causes one out of three people to sneeze. Some doctors call them "photics," from the Greek meaning "of light." Photic sneezers can blame their parents -- you inherit this trait.\n\nIf your sneeze comes with chest congestion, headache, yellow or green nasal discharge, fever or a stuffy nose, you may want to see a doctor. You could have a cold or allergy.\n\nYou may be tempted to stop a sneeze. Don't.
1165185
yes.  you sneeze when something irritates your inner nose.  all that happens is that a little piece of dust gets in the wrong place, and you wake up sneezing--but this does not happen very often.  it is very rare
853475
Sneezing contracts a lot of the muscles in your face, including the ones controlling your eyelids.\n\nAs for the people answering with the popping eyeballs: LOL!
3645
Because pepper water makes them sneeze.
913830
its possible that when you sneeze, your eyes close reflexively, to prevent your eyes from getting contaminated by whatever is coming out of your nose and mouth.  As well, the urge to sneeze (that tingling feeling in your nose) may play a part, due to the optic nerves for your eyes laying close to the nerves for your nose and recieveing some residual signal...