Why do I sneeze so much when I walk into sunlight?
594573
Photo-sensitivity causes a tiny skin reaction whereby the mucous membranes inside your nostrils can contract enough to vibrate sensitive nose hairs and trigger a resultant sneeze.  It's a genetic condition, like the ability to curl your tongue.  PS... Believe it or not, sexual arousal can cause the same vibration, and trigger a sneeze or two.  Very embarrassing!
141720
No...have you? (why don't you add some details to your question so we can find out if you have heard one)\n\nThanks for the explanation...I have no idea why you're hearing sneezes. Maybe it's a ghost or a spirit...
330018
Photic sneeze reflex (also whimsically called ACHOO, a backronym for Autosomal dominant Compelling Helio-Ophthalmic Outburst) is a medical condition by which people exposed to bright light sneeze. It has been suggested that the photic sneeze reflex occurs only after someone has been adapted to the dark for at least five minutes, although this is not certain, and is not uniform amongst people with the photic sneeze reflex. The photic sneeze reflex can also cause one to sneeze many times consecutively. The condition occurs in 17% to 25% of humans with more common occurrence in Caucasians than other human races. The condition is passed along genetically as an autosomal dominant trait.\n\nThe first mention of the phenomenon is probably in the later work attributed to Aristotle (Problems, book XXXIII).\n\nThe probable cause is a congenital malfunction in nerve signals in the trigeminal nerve nucleus. The fifth cranial nerve, called the trigeminal nerve, is apparently responsible for sneezes. Research suggests that some people have an association between this nerve and the nerve that transmits visual impulses to the brain. Overstimulation of the optic nerve triggers the trigeminal nerve, and this causes the photic sneeze reflex. Another theory suggests that tears leaking into the nose through the nasolacrimal duct are a cause of the photic sneeze reflex. The speed of the reflex seems to favour the first theory, as it happens much too quickly for tears to be generated and drain into the nose. In addition this sneeze reflex can be brought on by a sudden inhailing of cold air or a strong flavor such as a strong mint gum. This implies an overstimulation of any nerve close to the trigeminal nerve can cause the sneeze reflex.
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
314007
First of all not all people sneeze multiple times in a row.  The reason for sneezing is your body's primary defense against something trying to get in that shouldn't be there such as dust, pollen, bacteria, etc.  The little hairs in your nose are very sensitive and when something moves them it gets trapped inside and sneezing is how your body expels the invader from your nose or throat if it made it that far although coughing is usually more related to the throat.
1172491
It could be any number of things that are making him sneeze.\nFirst thing I'd suspect is the brand of litter.  Dust from that is very irritating.  Try another brand with a lower dust factor.\nOther causes could be carpeting, changing the AC dust filters, your cologne, cleaning fluids, indoor plants, etc.\n\nInvestigate these... you'll probably be able to ID the culprit very quick.
870320
ditto to the 2 answers above\n\nyou may get some peace from sneezing ect ... because you are relaxed\nbut you still CAN sneeze
824573
urination...busted blood vessels in the eye..cracked ribs.  I myself had my hymen break when I sneezed.  You're right crazy things happen.
462099
Because it makes your sinuses start running from the sudden heat.\nYou're not allergic to sunshine, I thought that kinda thing too and asked my doctor and he just said it's the heat making your sinuses run, so you sneeze.
264658
you  most likely have an allergy. it's coming upon spring time so that may be the problem righ there!
119554
From the website linked below: \n\nSince the detailed answer below got kind of long, I will summarize the main points up front. About 25% of people do actually sneeze when exposed to bright lights like the sun. We do not know exactly why this happens, but it might reflect a "crossing" of pathways in the brain, between the normal reflex of the eye in response to light and the sneezing reflex. There is no apparent benefit from "sun-sneezing", and it probably is nothing more than an unimportant (but annoying) holdover of evolution. \n\nRead the whole article for detailed information.
1088641
It really serves no purpose - however, it seems that the nerves to the nose and the eye are closely related - strong smells make your eyes water, bright lights can make you sneeze, and sneezing automatically makes you shut your eyes because the nerves are all so close.
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.
920736
If he's about to sneeze (and can feel it building up) then he should stare at a bright light (obviously not TOO bright or sneezing will be the least of his problems!) It stops you from sneezing! It does work...bout 50% of the time. God knows how though!\n Failing that, make him sit in the garden.At least you wont be able to hear him!!
538672
due to the sudden jerk you get while you sneeze, you automatically make you body tight and then suddenly it becomes loose. thus the blood pressure increases. \nSometimes people feely giddy due to a sudden and big sneeze. this is because, the brain cannot coincide with the blood pressure. thus it happens. but remember this is all just for quite a fraction of a second. \n\nHope it was clear enough.
468529
no its not possible to sneeze without closing ur eyes coz its a reflex action that happenes
80272
Don't open windows when the weather is warm, pollen rises during the night, wafting into your room on a light breeze and can contribute to more severe symptoms in the morning.  An air purifier like the Ionic Breeze would probably work wonders.  Try propping up on more pillows and use hypo-allergenic materials whenever possible.