Doesn’t specifically have to be motion sickness any explanation of nausea really.
In: Biology
Vomiting is the body’s primary defense against eating poisonous things. Poisonous things cause signals to get mixed up in the brain, and the body barfs to get the stuff out of the system. Motion sickness is when the body detects that the motion signals from the eyes don’t match the ones from the ear’s gyro sensors. Signal mismatch might be poisoning, so it’s time to barf.
As far as I know, your brain links the sensation of Motion Sickness with being poisoned, so you get nauseated and/or vomiting to clear out any (potential) poison in your system.
It’s essentially a very basic survival mechanism that has evolved over thousands of years, but in modern times it is triggered by other things.
Your brain doesn’t really understand what’s going on and it just runs off fuzzy logic developed over thousands of years before modern technology
For most of human existence, dizziness and a strange feeling in the stomach meant you ate something bad. When the poison alarm sounds your brain purges the system to try to get anything out that hasn’t already been absorbed
Unfortunately we now have ways of making you disoriented and sloshing up your stomach that don’t require eating the wrong mushroom, but your brain didn’t develop with rough seas and carnival rides so when the tilt-a-whirl gets going your brain goes POISON!!!! because it doesn’t know any better
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