Sneezing and sunlight and important points

The reason for sneezing

According to researchers, more than 30% of people sneeze while looking at the sun, and this is due to the stimulation of a part of the brain by exposure to sunlight.

Many people think that the heat of the sun that reaches the nose causes sneezing. It is not heat.

Aristotle believed that the heat of the sun dries the nasal passages and causes itching and sneezing, but apparently new science has another answer to this phenomenon.

Scientists called it a “light-dependent sneezing reaction” in 1954, but the research goes back hundreds of years.
This condition is also seen in babies, so it is not a reaction that we have learned, but a genetic process that exists in humans from the beginning.

At the mechanical level, these conditions can be caused by differences in brain signals.
Researchers believe that staring at intense sunlight and intense stimulation or intense activity of the optic nerves can be transmitted to the trigeminal or trigeminal nerves adjacent to these nerves.


This irritation causes a burning sensation in the nose and a sneezing reaction. However, the cause of this phenomenon is related to the brain.

A few years ago, researchers at the University of Zurich compared light-dependent sneezes to regular sneezes to test another theory. They measured a person’s brain waves using an electroencephalogram when intense light flashed onto the subject and found that sneezing from intense light caused more activity in the visual cortex. This indicates that very high sensitivity to light drives this reaction process to the brainstem.

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