What causes a fear of heights? - A Week in Science?

A fear of heights happens when your brain feels unsafe up high, just like when you're on a wobbly chair and feel like you might fall.

Your brain is like a smart detective, always watching for clues that something might go wrong. When you’re up high, like on a slide or a ladder, it sees that you’re far from the ground, and it thinks: “If I fall, it’ll hurt!” That’s when your body sends signals to make you feel scared, maybe even like you want to run away.

Your heart might beat faster, and your legs might get wobbly, just like when you’re about to jump into a pool and you feel nervous. That’s because your body is readying itself for action, like it's preparing for a big adventure or a quick escape.

Some people are more scared of heights than others, just like how some kids love climbing trees while others prefer to stay on the ground. It depends on how your brain and body react when you're up high, it’s all part of how we learn and grow!