system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:How come when we get hit in the balls the pain feels like it originates from up below the stomach?

Question pretty much explains it.
gpt
Before we're born, the testes are located in the abdomen. Slowly but steadily they descend lower and lower, until they are situated just above the scrotum. It takes puberty for the testes to fully descend into the scrotum.    
    
Painful sensations are sent over a specific pathway, different from the nerves that transmit other sensations. The funny thing is, the brain's pain center never gets the message that your nuts are now situated a couple of inches lower than where they used to be. So, your brain places the source of the pain in your lower abdomen.