Why yawning happens

If excessive yawning is a symptom of a serious medical condition, such as epilepsy or liver failure, then the underlying problem must be treated immediately. What does yawning say about you and your body? Teeth often shift after dental procedures and throughout your life. Learn why this happens and what you can do about it.

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Nothing is. Health Conditions Discover Plan Connect. Some researchers believe the reason humans yawn has more to do with evolution. Before humans communicated vocally, they may have used yawns to convey a message. Yawns are considered a sign of boredom or sleepiness, and that could be what early humans were communicating as well. However, early humans may have used yawning to signal their alertness to others, bare their teeth to aggressors, or serve as some other communication tool.

Humans and chimpanzees are not the only animals that yawn. All vertebrates yawn, from fish and birds to wolves and horses. There are only three species that yawn contagiously, however: humans, chimpanzees, and the family of wolves and dogs. One thing that many people agree on is that yawning appears to be contagious. Results revealed that the chimpanzees were more likely to catch the yawn when watching chimpanzees they were familiar with yawn.

This supports the idea that empathy and familiarity are involved in the contagiousness of a yawn. There was little correlation between intelligence, time of day, or empathy in those tested. The biggest factor they found was age. Older people were less likely to catch a yawn from others. Yawning is usually harmless, but it is possible to yawn too much.

Excessive yawning can be caused by a few different disorders that require medical attention. The vagus nerve, which is the nerve connecting the throat and abdomen to the brain, can cause excessive yawning by interacting with the blood vessels.

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Electromagnetic hypersensitivity EHS is a defined by unpleasant symptoms, like headaches and pain, triggered by exposure to electronic devices. That probably explains the popular perception that it is a way to get more oxygen into the blood to increase alertness. A closer look at when people yawn suggests another explanation.

It turns out that most spontaneous yawning actually happens when we are limbering up for activity such as a workout, performance or exam, or simply when we wake up. That has led to the idea that yawning helps us gear up by increasing blood flow to the brain. How exactly that might work is not clear, but it does fit with the observation that some fish yawn in anticipation of a fight. Another possibility is that yawning cools the brain.