Fear of heights may actually start in the feet, study finds

That dizzying, off-balance feeling when standing near a cliff’s edge might not be in your head at all—it could be in your feet. Professor Michelle Spear, an anatomy expert at the University of Bristol, has found that the nervous system amplifies sensation in the soles of the feet in such moments, generating an unusual vibration, tingling, or even a sense of heaviness.

Spear explains that the brain amplifies sensory signals related to balance and foot position, turning what is normally an unconscious, background process into a distinct sensation that can distract some people. This automatic reaction occurs regardless of a person’s will, though how acutely individuals perceive these changes varies widely.

For some, like experienced climbers, this heightened awareness of pressure and balance proves useful. For others, it creates a feeling of instability that forces them to stop and avoid moving closer to the edge. Researchers believe this system is an evolutionary adaptation designed to help our ancestors avoid fatal falls, as humans evolved in environments where falling posed significant dangers—whether while moving over uneven ground or climbing.

The scientists stress that this mechanism is entirely different from vertigo, which stems from an inner ear disorder and creates a false sense of motion.