A change in light may stimulate this nerve, creating the same sensation as having an irritant in the nose. One theory is that sneezing involves the optic nerve. The actual cause of photic sneeze reflex is unknown. The same study, however, did find a link between photic sneezing and a deviated nasal septum. The 1995 study found that fewer than 27 percent of photic sneezers interviewed were able to recall a parent with the same sneeze reflex. Similarly, if you’re driving through a tunnel on a bright, sunny day, you might start sneezing upon exiting the tunnel.Įven though this sneeze reflex is inherited, some researchers believe it’s also possible to acquire it, although more research is needed. But you may start sneezing if you step into direct sunlight. Sitting in a brightly lit house might not trigger a sneeze. It’s important to note that while bright light can bring on ACHOO syndrome, the reflex isn’t trigged by light itself, but by a change in light intensity. The way the reflex manifests in you might differ from those in your family. The number of sneezes could be as little as two or three, but some people report as many as 40 or more successive sneezes. But if you have the trait, you’ll likely sneeze multiple times in response to bright light. The gene responsible for photic sneezing hasn’t been identified. If one of your parents has this reflex, you have a 50 percent chance of inheriting ACHOO syndrome, too. But since sneezing is a regular occurrence, it’s possible to have this trait without realizing it. Photic sneeze reflex is an inherited, genetic trait. How do genetics affect photic sneeze reflex?
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