TIL that the photic sneeze reflex, or ACHOO (Autosomal Dominant Compelling Helioopthalmic Outburst) syndrome, is a genetic trait (inherited in an autosomal dominant manner) characterized by uncontrollable sneezing in response to the sudden exposure to bright light, typically intense sunlight.

Read more: https://www.ncbi.nlm.nih.gov/books/NBK109193

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  1. # Characteristics:

    About one in four individuals who already have a prickling sensation in their nose will sneeze in response to sunlight, but “pure” photic sneezing is far less common. Sneezing is usually triggered by contact with infectious agents or after inhaling irritants, but the cause of photic sneezing is not fully understood. It may involve an over-excitability of the visual cortex in response to light, leading to a stronger activation of the secondary somatosensory areas.

    # Diagnosis/testing:

    The diagnosis of ACHOO syndrome is usually made by clinical history. Affected individuals report a “prickling sensation” or sneezing in response to a bright light. This response may be reproduced in the clinical setting by asking the individual to look at a bright light, although findings are unreliable.

    The genetic basis of this syndrome is not yet known.

    # Management:

    Recommendations for management of ACHOO syndrome include using a hat or sunglasses to shield the eyes from direct sunlight whenever possible. Potential hazards include the possibility of drivers having an accident caused by sneezing brought on by, for example, exiting a road tunnel on a bright day. Similarly, airline pilots may be at risk.

    # Genetic Counceling:

    ACHOO syndrome is inherited in an autosomal dominant manner. As such, if one parent is affected, their child has a 50% chance of inheriting the syndrome.

    [(source is post link)](https://www.ncbi.nlm.nih.gov/books/NBK109193/)

  2. I’ve always had this, and people (such as my father) think I’m making it up. I can even think of looking at a bright light/the sun and it can help me sneeze.

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