What Is the Vestibular System? Your vestibular system sits deep inside the inner ear. It works like a balance sensor, constantly sending information to your brain about your head movement, body position and where you are in space. When this system isn’t working properly, the brain receives mismatched or incomplete information, leading to: Dizziness Vertigo (spinning sensation) Nausea Imbalance or unsteadiness Difficulty concentrating Sensitivity to head movements