system
Given the following post, respond as if you're commenting on Reddit:
human
When people get "butterflies" in their stomach, what is actually going on? And why does it only happen when they're nervous?

This happens to me on first dates, before a big presentation, etc. Why does my body want to throw up, as if that would help anything?
gpt
adrenaline and other stress hormones cause vasodilation in your leg muscles (and other muscles, but mostly leg), which causes blood to flow away from other organs into the muscles and liver. this means blood will leave the vessels near your stomach. the butterflies feeling is due to blood going away from the stomach.