system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: When someone gets hit in the testicles, why is there a extreme nauseous feeling in the stomach and how are the two correlated?
gpt
The testicles are formed in the abdomen where the ovaries are in a woman. They usually descend to where they normally are by the time an infant is 9 months old.

The testicles still have nerves that are linked to the abdomen where they were originally formed. Therefore, contact with them causes the feelings in your stomach.