Why do you shed tears when you yawn?

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?

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.

Tears are stored in the lacrimal sac, and when the tear duct is open, they are usually not expelled or can enter the nasal cavity through the nasolacrimal duct. Facial muscle tension during yawning will cause increased pressure in the mouth and nasal cavity, and tears cannot flow into the lower nasal passages and tear ducts, yawning and tears will occur, mostly caused by drowsiness and other factors, usually relieved after rest.

Tears are a weakly acidic transparent colorless liquid, which contains water, inorganic salts, proteins, lysozyme, immunoglobulin A and other substances. Occasional yawning accompanied by tearing is mostly normal and does not require intervention, but if this symptom occurs for a long time, there may be cerebrovascular disease or obstructive sleep apnea-hypopnea syndrome and other diseases, which need to be timely ** to avoid adverse consequences such as respiratory failure.

If the patient has frequent tearing regardless of whether he yawns or not, it may be related to the occlusion of the tear duct caused by diseases such as punctal blockage, dacryocystitis, and nasal tumors. At this time, it is recommended that the patient go to a regular hospital for treatment in time.

Shedding a lot of tears when yawning may be a normal physiological phenomenon, or it may be caused by overuse of the eyes, lack of sleep, brain lesions, etc.

1.Normal physiological phenomenon.

The eyes and nasal cavity are connected by nasolacrimal ducts, and every time you blink your eyes, excess tears flow into the nasolacrimal ducts and enter the nasal cavity. When yawning, the facial muscles are tense and contracted, the nasolacrimal duct is squeezed and blocked, and the tears cannot be discharged into the nasal cavity in time, and tears will flow, so yawning and tears are mostly normal physiological phenomena.

2.Overuse of the eyes.

Tears are a reliever when the eyes are tired, and looking at the computer and playing with the mobile phone for a long time will cause the eyes to be overtired, and more tears will be secreted to relieve it. When you are overtired, you yawn, and your tear glands secrete more tears, so you will shed tears.

3.Lack of sleep.

Frequent yawning and tearing may be caused by staying up late and not getting enough sleep. If you yawn too often, tears will flow if you can't enter the nasolacrimal ducts.

4.Brain lesions.

When suffering from brain diseases, neuromodulation is abnormal, the lacrimal glands are uncontrolled, and many tears often flow when yawning.

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

Because the eyelids constrict, they compress the tear glands and promote tear production.

Tears are secreted all the time, because usually tears are not secreted much, these tears will flow through the tear dots and discharge from the nasal cavity through the nasolacrimal duct, so you will not have tears in normal times.

However, when you yawn, you breathe in as much oxygen as you can to exhale carbon dioxide. The muscles of the cheeks, tongue and throat contract, increasing pressure in the mouth and nose. As a result of increased nasal pressure, the nasolacrimal duct is unable to discharge tears, and as more and more tears accumulate in the tear sac, tears will appear and burst out of the eyes.