When you breathe in through your nose, lots of tiny pieces of dust come inside along with the air. Some of the dust is stopped by the hairs in your nostrils, but much of it passes further inside. Most of the inside of your nose is lined with a special membrane that makes a sticky liquid called mucus. As the dust is pulled through your nasal passages, it gets stuck in the mucus. Normally, the mucus and dust is moved toward the back of your nose by millions of extremely tiny hairs called cilia, and you swallow it. But sometimes, too much dust gets caught in the mucus, and it irritates the lining of your nose. At that point, you feel a big tickle in your nose, and your sneeze reflex is triggered. You quickly take in a big breath, filling your lungs. Then, your chest muscles compress the air, causing it to forcefully blast out of your mouth and nose, expelling thousands of droplets of saliva and mucus, and with it, the dust that made you sneeze.
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Its a condition called Photic Nerve Sneezing. It is caused from the rapid dialition of the eyes when walking out of a room that is dark and into a lighter room or outside. The light hits a nerve which causes you to sneeze. It is hereditary.
Every time we breathe in, lots of tiny dust particles get pulled into our noses along with the air. Usually, they're just caught in the layer of sticky mucus that lines the inside of your nose and nothing happens. But sometimes, some of the dust bothers, or irritates, the inside of your nose. When this happens, our bodies automatically sneeze in an attempt to expel the irritant.