十万个为什么·科学启蒙30篇（3）

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人为什么会晕车

Carsickness happens when your eyes, inner ears, and muscles send conflicting signals to your brain.
While riding in a car, your eyes may focus on a still book or phone screen.
But your inner ear senses motion as the vehicle speeds up, slows down, or turns.
Your body’s sensory mismatch tricks your brain into thinking you might be poisoned.
This triggers nausea, sweating, dizziness, and sometimes vomiting as a defense response.
Children aged 2–12 are especially prone because their balance systems are still developing.
Looking out the front window helps match visual input with motion sensed by the inner ear.
Taking breaks, breathing fresh air, or chewing ginger can reduce symptoms for many people.
Medications like dimenhydrinate work by blocking signals between the inner ear and brain.
Unlike seasickness, carsickness rarely lasts long after the ride ends.