What is the primary function of emotional crying?

why does the body respond this way? to indicate you need help? Many people don't feel the need to help someone they pass by crying and many are put off by it... How does crying benefit the body? many of the bodys functions try to compensate, but crying just releases water right? does this reduce pressure? or... show more why does the body respond this way? to indicate you need help? Many people don't feel the need to help someone they pass by crying and many are put off by it... How does crying benefit the body? many of the bodys functions try to compensate, but crying just releases water right? does this reduce pressure? or does it release other chemicals to stimulate and crying is a side effect?
hopefully you get what i am getting at

"The other chemical found in emotional tears is leucine-enkephalin, an endorphin that reduces pain and works to improve mood." If this is true why wouldn't the body use the chemical rather than excrete it? Or is this an overflow?
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