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Do bright lights make you sneeze? Well, you're not alone. It is estimated that 18% to 35% of people worldwide are affected by the ACHOO syndrome, an autosomal dominant helio-ophthalmic obsessive-compulsive seizure. It's not a dangerous condition, but it continues to baffle scientists. Records of ACHOO syndrome date back to 350 BC. found. Unlike normal sneezing, which occurs after the nasal mucosa is irritated by particles, there is no physical trigger other than a bright light. This can occur outdoors when the sun is shining, or indoors after turning on the lights. "The reflections appear to be caused by changes in light intensity rather than specific types or wavelengths of light," he says. Annie Nguyen, an ophthalmologist at the University of Southern California Keck Medicine. 

Scientists know that ACHOO syndrome is hereditary, but the cause is still unknown. Some previous theories suggest that bright lights that constrict the pupils stimulate the nose. Another researcher suggests that this is due to greater sensitivity to visual stimuli. 

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