Why Do Humans Fear Heights?

Imagine standing on the edge of a high balcony. Your heart beats fast and your knees feel shaky. This is your body saying stop.

Long ago, humans lived in trees and on cliffs. Falling meant death. Our brains kept this old rule. It is a safety check built into us.

Your eyes send a picture to your brain. When you look down, the picture shows a big empty space. The brain gets scared. It calls it danger.

Your inner ear helps you stand still. High up, the wind and small movements confuse it. You feel dizzy. This is normal. It is your body trying to keep you safe from falling.

Some people do not feel scared. Their brains learned that glass is strong.