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 dizziness-inducing 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 ยท December 1994.
In which the authors note, however :
โ[โฆ] the mechanism by which vestibular stimulation ultimately leads to motion-sickness signs and symptoms, including emesis, has by no means been established.โ
Also see :
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