if someone slaps you in the nuts, the pain isn’t the same at all. It’s a different kind of pain. Why?

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if I slap someone on the cheek, on the butt or if one brokes his leg, the pain has different intensity but it’s the same “kind” of pain. Same if I’m burned with hot water or have appendicitis. I experienced all of these. But if someone slaps you in the nuts, the pain isn’t the same at all. It’s a different kind of pain. Why?

In: Biology
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That’s millions of years of evolution trying to convince you to protect the baby makers at all cost. As to why specifically it’s a spreading soulwrenching form of pain that spills over into several other nervous systems causing anything from nausea to headache that’s a complicated neuroscience question I’m not certain anyone can answer exactly.

It’s called “visceral pain”. It’s the same kind of pain you’d get if someone were to slap your intestines.
You’re not used to your viscera (abdominal organs) being in pain… because it’s quite unusual. So your brain isnt used to processing it. This is why it’s not very well localised (your whole stomach hurts, not just a particular area) and why it feels weird and different.

The reason your abdomen hurts, and the reason it hurts like your abdomen, is because when you form as a foetus, your testes are formed from the same tissues that make up some of your abdomen, and they then drop down into your scrotum. So your brain registers them as being part of your abdomen for this kind of thing.

It’s also worth adding that a lot of these concepts are quite poorly understood, so you may not really get a concrete answer.

The nerves in your testicle sacks are incredibly sensitive and hyperspecialised. They don’t just give you generic “somethings happening” pain signals, they give you “somethings happening and it needs to stop IMMEDIATLY” signals. This is because the entire purpose of life is to make more of itself and getting the organs dedicated to that damaged is effectively an evolutionarily death sentence.