anon-283697 on 27 Mar 2021.
anon answered on 19 Mar 2021:
This is really a great question! This isn’t really a consensus in science as to why people cry. From an evolutionary perspective even Darwin called it pretty useless! We as humans are not alone in crying, which I think is pretty fascinating – though this seems to be more as a consequence of pain etc. Compared to humans who do it as reaction to emotions and feelings.
Though it also seems that what we do know about crying is it goes beyond just a reaction to negative feelings. Why do we cry from happiness? Why do we cry in love? So many interesting questions your original question raises! This has led to some to see it as a means of social bonding, so as means of furthering human connection.
I think its also cool to note that scientists have found differences between crying tears from chopping onions and crying from emotions at the chemical level of tears.
But I think as David pointed out, we still don’t really know why we cry, maybe one day science can answer this fully!