system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What causes the sick to the stomach feeling?
gpt
Blood rushing from the stomach to other parts of the body. Depending on the situation you're in depends on how the body reacts, so for example if you're scared, you're body will divert the majority of blood to your limbs in order for you to fight or run more effectively. The same for when you see your crush, the your body will divert blood away from your stomach to your genitals...for obvious reasons.