system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does it feel good to cry when we're sad?
gpt
Crying is the bodies way of ridding stress hormones/chemicals from the body is a fast manner. Tears shed from stress/sadness are higher in manganese, potassium, certain proteins, and stress hormones like cortisol. There is also an endorphin release to further boost crying's mood altering effect.

This is why it's actually very therapeutic and beneficial to let yourself cry when you're upset :)