Human Body
Why Do We Get Motion Sickness? The Science of Sensory Conflict
Motion sickness strikes when your inner-ear vestibular system, eyes, and body position sensors send the brain conflicting motion signals. The leading explanation is the sensory-conflict theory, supported by the evolutionary toxin-detector hypothesis: your brain interprets the contradiction as a sign of poisoning and triggers nausea, sweating, and dizziness as a purge reflex. Reading in a moving car, standing below deck on a boat in rough seas, or piloting a flight simulator worsens the conflict. This response is ancient, rooted in survival.