Dizziness and nausea is frequently caused by unusual physical motion (or perceived motion) - e.g. air sickness, sea sickness, car sickness, VR simulation sickness etc etc.
There are three commonly-documented versions :
There are currently two main theories about why this might happen :
The first is that it's a mistaken defence against neurotoxins, in other words an emetic effect designed to eliminate ingested toxins which (can) have very similar effects.
The second theory is the 'Nystagmus Hypothesis' which is explained here in : The possible role of nystagmus in motion sickness: A hypothesis Aviation Space and Environmental Medicine, 65(11):1032-5 · December 1994.
In which the authors note, however :
“[…] the mechanism by which vestibular stimulation ultimately leads to motion-sickness signs and symptoms, including emesis, has by no means been established.”
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