Most Helpful Girl
Crying is a release of hormones:
There are multiple kinds of tears and when you have a surge of hormones (adrenaline, happiness, sadness, etc.) you need to release that from your body and literally you cry out the excess.
If you want more info:
Most Helpful Guy
i imagine it's just a heightened emotional there is a connection between your tear ducts and the part of your brain that processes emotions
so it may be a stress relief to some but really it's just your brain experiencing a heightened emotion and the tear ducts being activated via that neural connection
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