What make TEARS of joy and Tears of pain??

Question

I want to know how do our mind know to cry when we are happy? but also cry when we are sad?

Answer 1

I think, intensity of emotions of joy or pain make the tears.

I think, crying is some sort of reflex action.

Answer 2

God is genius.

Answer 3

I can tell you this there are different chemicals in our tears. For instance, the tears we cry for different reasons have different chemicals. How neat is that!