Why do people shed tears when they yawn?

Yawning and tearing are mainly caused by the following reasons:

1. Lack of sleep: frequent yawning, tears, to consider whether the patient has sleep disorders, such as frequent insomnia or frequent dreaming, early awakening and other sleep disorders, if so, it is highly suspected that this symptom is caused by insomnia caused by lack of sleep;

2. Sleep disorder: sleep disorder, also known as OSAHS syndrome, also known as sleep apnea-hypopnea syndrome, the patient has enough sleep time, but because of the low ventilation at night, the blood supply and oxygen supply to the head are not good, and it will also lead to the manifestation of cerebral hypoxia the next day, and this symptom appears;

3. Cerebral arteriosclerosis: patients with diabetes, hypertension and hyperlipidemia, especially those who cause atherosclerosis after age, and this symptom will occur when there is insufficient blood supply to the head, often accompanied by headache, dizziness, insomnia, memory loss and other manifestations of cerebral atherosclerosis;

4. Mood: Combined with obvious anxiety and depression, this symptom will also occur;

5. Increased intracranial pressure: due to increased intracranial pressure caused by other diseases, yawning and tearing will also occur in this case, indicating increased intracranial pressure, and urgent examination is required to judge and treat urgently.

We yawn when we are very tired, very tired, or sleep deprived, and every time we yawn, we are in tears, why do people shed tears when we yawn?

Why do people shed tears when they yawn? Star Awareness Project

When I'm sleepy, I always yawn. When you yawn, your eyes will always be full of tears, why do people shed tears when they yawn?

Human tears are secreted all the time, flowing on the surface of the eyeball. However, there is very little tears secreted and they flow along the surface of the eyeball and in the tiny spaces inside the eyelids, so you don't feel that the tears are flowing.

However, in the blink of an eye, the tears on the surface of these eyeballs are sucked into the nasolacrimal duct, the sewer of the tears. Don't underestimate this not-so-long tube, it's the only way for tears to reach your nose. The lacrimal glands constantly secrete tears, and the nasolacrimal ducts constantly excrete tears, so people usually do not shed tears.

When a person yawns, his mouth is wide open, and he may exhale more than he can out of his body in order to exhale carbon dioxide and inhale oxygen. With the action of yawning, a stream of gas exhales forcefully from the mouth. The muscles of the cheeks, tongue and throat tense and contract, and the pressure in the mouth and nose increases.

As a result of the increased pressure in the nasal cavity, it will temporarily block the work of the nasolacrimal duct to excrete tears, and the "sewer" will not be passed, and the tears will not flow, and more and more tears will accumulate in the eyes. There will be tears in his eyes, and finally he will burst out of his eyes and flow to his face.

In fact, not only yawning can cause tears, but also when people laugh, sneeze, cough, and vomit, and the reason is the same.

Why do people shed tears when they yawn? Star Awareness Project

Because yawning causes tension in the nerves near the lacrimal glands, which causes the lacrimal glands to be squeezed, it is normal to leave tears.

Why do people yawn?