That need to sneeze could all be down to your genesI don’t have hay fever, but based on how I react to walking outside on a hot day would convince you I do. For some reason, getting off the train into the sun, opening my door onto a sunny vista, and even leaving a tree’s shadow into a bright spot triggers a huge, eye-watering sneeze – and until now, I had no idea why. But it turns out it might be my genes, per the Cleveland Clinic.It sounds like I’m experiencing a “photic sneeze reflex,” also known as “autosomal dominant compelling helio-ophthalmic outburst syndrome” (ACHOO syndrome – teehee). What is a “photic sneeze reflex” or ACHOO syndrome?An extract from Medical Genetics Summaries says that “Affected indiv