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Tears can result from any kind of emotion generally, or just to moisturize the surface of the eye.
Crying generally releases certain chemicals (in emotionally tears, manganese and prolactin) which contribute to the temperament of people. Crying is thought to be a way of releasing excess chemicals from the body and balancing stress levels.
I really cant say why but I know that I have laughed until I cried so many times!! Shew, thats the best feeling in the world.