There are several types of tears.
The substances contained in tears vary from time to time.
“Basal tears” are secreted to moisturize the eyeball.
“Reflex tears” are secreted to eliminate foreign substances in the eye.
Tears that are secreted when sad or happy belong to the “reflex” and are secreted by the command of the brain stem.
When you get stressed, you will feel better if you shed tears.
This is because tears contain a stressful hormone called “cortisol.”
Stress is reduced by excreting cortisol from the body.
– MedlinePlus: Tears