I get like washing down mucus when something gets in your eyes, but a lot of times crying is caused when you’re feeling a lot of emotions like happiness, anger, sadness, or just pain in general.
Why so?
In: Biology
It serves a social function: when you’re experiencing big emotions, it’s useful to let others near you know that you’re not your usual self.
On a biological level, humans are very very social. Our tool-using, group-oriented, and socially complex brains are super useful. Telling a group you REALLY need help is useful (and everyone is better off for it). Crying says— I need help!
[ELI20 link](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6201288/)
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