> ELI5: achoo syndrome Why do some people sneeze when they see bright light? ☀️ STEP 1 👀 You look at the sun (or bright light) STEP 2 🧠 Wires get mixed up! Eye nerve 👁️ talks to nose nerve 👃 STEP 3 🤧 ACHOO! 💥 Nose thinks something tickled it! 🏷️ What's it called? ACHOO Syndrome Autosomal Compelling Helio- Ophthalmic Outburst Also called: "photic sneeze reflex" ☀️ Triggered by: sunlight, bright screens 👥 How many people have it? 👤👤👤 👤👤👤👤👤👤👤 ~1 in 4 people sneeze at bright light! 🧬 It's inherited — runs in families ✅ Is it dangerous? Nope! 😄 It's totally harmless Just a quirky brain glitch! 💡 Tip: wear sunglasses outdoors eli5.cc

ELI5: achoo syndrome

high confidence
April 11, 2026
// explanation
// eli5Imagine your nose has a funny switch that gets flipped when bright light goes into your eyes - like sunshine or a bright lamp. When that happens, your nose thinks it needs to sneeze, even though there's no dust or pollen! [1][3] It's like your body's wires got a little mixed up, so light signals accidentally trigger your sneeze reflex. This happens to some people because they inherited this quirky trait from their parents [2].

// sources

[1]ACHOO Syndrome - Medical Genetics Summaries - NCBI Bookshelf

Oct 15, 2012 ... Autosomal Dominant Compelling Helioopthalmic Outburst (ACHOO) Syndrome is characterized by uncontrollable sneezing in response to the sudden ...

[2]Photic sneeze reflex - Wikipedia

The photic sneeze reflex (also known as ACHOO syndrome, a contrived acronym for Autosomal-dominant Compelling Helio-Ophthalmic Outburst) is an inherited ...

[3]Achoo syndrome - NIH Genetic Testing Registry (GTR) - NCBI

Achoo syndrome is characterized by uncontrollable sneezing in response to the sudden exposure to bright light, typically intense sunlight.

[4]Why Do You Sneeze When You Look at the Sun?

Jul 10, 2023 ... If you sneeze uncontrollably when you see the sun or a bright light shines in your eyes, you probably have a photic sneeze reflex, or ACHOO syndrome.

[5]ACHOO Syndrome: A Strange Reflex That Causes Sneezing in the ...

Sep 8, 2025 ... Discover how ACHOO syndrome links light exposure to involuntary sneezing, shedding light on genetic and neural mechanisms behind this ...

[6]This is ACHOO syndrome or the photic reflex. And its genetically inherited. #sneeze #sneezing #neurovideo

Video by Zayed Almadidy, MD (Dr. Z Neurosurgery)

This is ACHOO syndrome or the photic reflex. And its genetically inherited. #sneeze #sneezing #neuro
[7]Only 17% of People Have This Sneezing Syndrome #light Achoo syndrome, formally known as the "Photicvideo

Video by Dr Sermed Mezher

Only 17% of People Have This Sneezing Syndrome #light Achoo syndrome, formally known as the "Photic
[8]Why do some people sneeze to bright light?video

Video by Wonder Labs

Why do some people sneeze to bright light?

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