Tears are the body's response to a stimulus. Emotions certainly cause tension. Each emotion has its own manifestation, be it anger or joy, but the force of their influence causes something like “heating up the system”, and when emotions are very strong (delight, grief, happiness), our” system”, the nervous system, requires discharge, and uses tear channels for this. That's why you cry with joy and joy, as well as with grief.
Tears are the body's response to a stimulus. Emotions certainly cause tension. Each emotion has its own manifestation, be it anger or joy, but the force of their influence causes something like “heating up the system”, and when emotions are very strong (delight, grief, happiness), our” system”, the nervous system, requires discharge, and uses tear channels for this. That's why you cry with joy and joy, as well as with grief.