The inner ear is a small, maze-like structure deep inside your skull, behind your eardrum, where sound waves get transformed into signals your brain can understand. When sound reaches your inner ear, thousands of tiny hair cells inside a spiral tube called the cochlea vibrate and send electrical messages along nerves to your brain. Without your inner ear working properly, you couldn't hear at all.

But the inner ear does something else just as important: it helps you balance. Three curved tubes filled with fluid, called the semicircular canals, detect when you tilt your head, spin around, or move in any direction. When you jump off a swing or spin in circles until you're dizzy, that wobbly feeling comes from the fluid in your inner ear still sloshing around after you stop moving. Your brain uses signals from your inner ear to figure out which way is up and to keep you steady on your feet.

Ear infections rarely reach the inner ear, but when they do, people might feel dizzy or have trouble hearing. The inner ear is protected deep inside the hard bone of your skull, keeping these delicate structures safe so you can both hear the world and move through it with confidence.