Smiling tears, have you ever been like that? But why is that so?

Everyone laughs when happy, crying when sad, but why sometimes even laughing when happy, people also shed tears? Find out how science explains this phenomenon!

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Tears are a surface-tasting liquid and are made up of:

1. Water : secreted from the lacrimal glands in the eye socket.
2. Fat : 30 - 40 secretions of tiny lymph nodes in the eyelid.
3. Mucus : produced by cells in the mucosa on the surface of the eye. This mucus covers the water layer and keeps it in the eye, preventing tears from evaporating too quickly.

However, the eyes and nose are connected to each other through the nasal glands. Normally, the amount of tears produced is not much, distributed in the eye surface and flows along the eyelid slit.

But when the eyes are closed, a small amount of tears will flow into the nasal cavity through the nasal passages that we never noticed.

When laughing, the eyelids squeeze and create a great force, causing tears to flow into the nasal gland more. At this point, the nasal cavity increases, the nasal gland is blocked, so the tears no longer "escape route" through the nasal passages.

The more you laugh, the more tears will accumulate and when it reaches a certain level it will automatically flow in the corner of your eye. We feel like we are crying.

Oriana Aragon, a psychologist at Yale University in the US, said tears flowed when we were overwhelmed by strong emotions. His research also shows that people who often have negative reactions (tears of eyes) with positive news (good news) can control their emotions more intensely than others.