十万个为什么·科学启蒙30篇（3）
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Why Do People Get Carsick?
人为什么会晕车
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Carsickness happens when your eyes, inner ears, and muscles send conflicting signals to your brain.
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While riding in a car, your eyes may focus on a still book or phone screen.
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But your inner ear senses motion as the vehicle speeds up, slows down, or turns.
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Your body’s sensory mismatch tricks your brain into thinking you might be poisoned.
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This triggers nausea, sweating, dizziness, and sometimes vomiting as a defense response.
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Children aged 2–12 are especially prone because their balance systems are still developing.
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Looking out the front window helps match visual input with motion sensed by the inner ear.
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Taking breaks, breathing fresh air, or chewing ginger can reduce symptoms for many people.
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Medications like dimenhydrinate work by blocking signals between the inner ear and brain.
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Unlike seasickness, carsickness rarely lasts long after the ride ends.