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

Article Update On:

October 1, 2025

Published On:

June 30, 2024

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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⁾

Page Contents

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.

💡 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.
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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.

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.

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.

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