The vestibular system: movement, gravity, and ‘up’

The vestibular system lives in the inner ear. Fluid, tiny crystals, and three loops of canal. It is not hearing. It is the sense of movement and of gravity — whether you are still, tipping, turning, or falling.

When the system is hungry, people rock, swing, spin, hang upside down, or ride for the motion. When it is already too much, a car, a lift, a playground spin, looking up at trees, or being tipped without warning can make the world unsafe. Both can be true in one day.

Car sickness is a common mismatch: the eyes say the cabin is still; the ears say you are moving. Looking at a far horizon, sitting in the front, or closing the eyes can help. Looking down at a phone usually does not.

You cannot see this sense from the outside, so rocking gets called fidgeting and spinning gets called showing off. They are often the system doing its work. Offer a chair that can rock, a walk, a swing. Do not tip, spin, or lift someone as a joke. If they are dizzy or sick, sit. Wait. Do not ask them to “walk it off”.