Why Do We Feel Motion Sickness?

Imagine your body is a tiny spaceship. You have three ways to check if you are moving: your eyes, your ears, and your muscles. Usually, they all agree. If you see something moving, your ears feel the motion, and your muscles tense up. They all shout 'We are moving!'

Motion sickness happens when these three reporters give different news. For example, you sit in a car and look at your phone screen. Your eyes tell your brain that nothing is moving because the screen is still. But your ears feel the bumps and turns of the road. Your muscles say they are sitting still.

Your brain gets confused by this mixed message. It thinks you might be poisoned or hallucinating. To protect you, it tells your stomach to empty out. This is why you feel dizzy, sweaty, and need to throw up when the signals don't match.