Tears are made up of different chemicals & are structurally different from each other. Different types have distinct molecules. Emotional tears have protein-based hormones including the neurotransmitter leucine enkephalin, which a natural painkiller released when we are stressed.

The most painful tears are the ones we see our lived ones crying when we can& #39;t do anything to take away their pain or fear.

And those that happen when the autocorrect spells lived rather than loved. Ffs...