system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 why we cry when feeling intense emotions

Why is it that the body's response to strong feelings like sadness, pain, or even Joy is to produce and release salt water from our eyes.
gpt
There is 3 types of tears in your eyes. 

* Basal - The fluids of the eye
* Reflex - These are responses to say irritants
* Emotional 

It's believed that sadness, pain, joy, anger and other intense sensations produce a chemical soup in the brain that might be toxic and that crying is a way to get rid of these chemicals. 

Scientist did tests and confirmed that reflex tears from smoke or onions are different in composition from say tears from watching a sad movie or pain.

But this is so far only speculation.