Like, for example, if you eat something spoiled or otherwise gross you might feel nauseous because your body wants it out of your system. Same thing goes for if you eat way too much. I don’t see a reason why vomiting would help in the event of nausea, nor do I see how nervousness or anxiety would be able to manifest as the physical symptom of nausea.
In: Biology
Your inside guts are very complicated and squished together, so there arent as many nerves in there. Pretty much just the one, vagus nerve (can you distinguish your intestines over your stomach by feel alone?). When something is wrong, and your brain can’t figure out what, it assumes that theres something in that complicated squishy place, and send the signal to the one nerve that makes that nausea feeling.
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