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Why Do Some People Sneeze When They Look at the Sun?

5 min read |
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Experts from Mayo Clinic give us scientific explanation behind some strange reactions in the body. We have experts from orthopedics and sports medicine at the Mayo Clinic. Asked Amy Runtala.(1)

Why do some people sneeze when they look at the sun?

It is known as “photic sneezing” reflex or “sunslap”. This is an involuntary reaction that some experience when they look directly in bright light, such as the sun. This is the specialty of about 18 to 35% of the world’s population. 

The exact cause of photic sneezing is not yet fully understood, but it is believed that there is interaction between optical nerves and veins in the autonomic nervous system, which controls the body’s involuntary functions.

sunglass
💡 Expert Insights.
Theoretical explanation behind this reaction is as follows: The optic nerve, which detects changes in light, is close to the trigeminal nerve, which controls sneezing. A specific sneeze is caused by nose irritation, which activates the trigeminal nerve and triggers a sneeze. 
When a dark room is burnt burned, the students compress.
It starts quickly in the reflex optic nerve and can give a feeling of nasal irritation and causes sneezing. Not all people have this answer, and it is not clear why some people do and others do not.

Importance of It.

It is important to note that although the photic sneeze is usually gentle, it can be harmful to see the sun directly to the eyes. Therefore, it is always recommended to avoid seeing the sun and taking action to protect your eyes from strong sunlight by wearing the right sunglasses.

Mayo Clinic is a non -profit organization dedicated to the innovation of clinical practice, education and research, and provides competence, compassion and answers to all those who need to regain health. You can enter the Mayo Clinic information network to read more news.

Additional Insights.

It is also known as the ACHOO Syndrome (Autosomal Dominant Compelling Helio- Ophthalmic Outburst ). It is said to be genetically predisposed usually familial. One-third of the world population can fall victim to it. Although it is harmless, it is occasionally dangerous in circumstances such as driving out of a tunnel into the sunlight, whereby there is a sudden sneeze and therefore is distracting.

Expert Interview.

Q What is the answer to whether photic sneezing is dangerous?
A:
Not by itself. It’s usually harmless. The danger is environmental in nature- such as sneezing when driving or using heavy machinery.

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Q: Can we prevent it?
A:
Yes, it can be minimized with wearing a pair of sunglasses or getting used to light when going outside.

Q: Does it imply that I have allergies?
A:
No, photic sneezing neither has anything to do with allergies nor cold. It is a reflex of a straight forward nervous system.

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Frequently Asked Questions.

1. What is photic sneezing?

This is an automatic sneeze that is caused by abrupt exposure to bright light like sunlight.

2. Is it harmful?

No, it is safe in most instances but sneezing suddenly in potentially dangerous circumstances (such as driving) can be dangerous.

3. Why does it happen?

Due to nerve cross-talk between the optic nerve (eye) and trigeminal nerve (nose).

4. Do all people have it?

No, it only affects 18-35 per cent. of the population.

5. Is it genetic?

Yes, there is some research that photic sneezing is familial and is inherited.

6. Can sunglasses help?

Yes, good quality UV-blocking sunglasses can help to reduce glare and sneeze less.

7. Am I to examine the sun to prove it?

No. You should never stare at the sun because it may permanently destroy your eyes.

Bottom Line.

The photic sneezing or the sun sneeze is a non-hazardous, reflex that occurs in individuals when exposed to extreme bright light. It is an interesting confusion of nerve impulses, and not a health condition. Although it is generally harmless, it is a good lesson that you should always wear protective gear on your eyes during a sunny day.

And the next time you go out in the sun and sneeze, you will remember– it is only your nervous system, playing its queer trick, nothing more.

+1 Source

Freaktofit has strict sourcing guidelines and relies on peer-reviewed studies, educational research institutes, and medical organizations. We avoid using tertiary references. You can learn more about how we ensure our content is accurate and up-to-date by reading our editorial policy.

  1. Don’t let an injury slow you down.; https://www.mayoclinichealthsystem.org/services-and-treatments/sports-medicine

Last reviewed on April 11, 2026

How we reviewed this article:

ⓘ Sources

FreakToFit follows strict sourcing guidelines and relies on peer-reviewed studies, academic research institutions, and reputable medical organizations. We only use high-quality, credible sources to ensure the accuracy and integrity of our content.

🕖 History

Our experts continually monitor the health and wellness space, and we update our articles when new information becomes available

Current Version

Written by Nebadita (Diet & Health Expert), M.S

Reviewed by Arno Kroner

Updated: Apr 11, 2026

Jun 30, 2024

Written by Nebadita (Diet & Health Expert), M.S

Reviewed by Arno Kroner

The information shared in this article is for educational purposes only and should not replace professional medical consultation. Always speak with a qualified healthcare provider about any health concerns or treatments. Know More

Nebadita is experienced in the field of nutrition, health, fitness, and more. Nebadita earned Master Degree from National Institute of Nutrition, Hyderabad and currently serving in the Eastern branch of ICMR. Know More. Learn about our editorial process..
338 article(s) published
Arno Kroner, DAOM, LAc, is a board-certified acupuncturist, herbalist, and integrative medicinal drug health practitioner working a non-public exercise in Santa Monica, California. Dr. Kroner's...
Acupuncturist
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