What is Subglottal pressure?

Subglottal pressure is the pushy force that helps you make sounds when you talk or laugh.

Imagine you're blowing up a balloon. The more air you push into it, the bigger it gets, and the harder it pushes back. Your voice works in a similar way. Inside your throat, just below your vocal cords, there's a space called the subglottal area. When you breathe out, air flows from your lungs up through this space, creating pressure, like the air pushing against the balloon.

Think of your vocal cords as little flaps that can open and close. When subglottal pressure builds up enough, it pushes those flaps apart, making a whoosh of air, just like when you let go of a balloon and it whooshes out. This whoosh is the start of every sound you make.

As the air flows through your vocal cords, they vibrate, like reeds in a musical instrument, creating a sound that travels up to your mouth and comes out as speech or laughter. So, subglottal pressure is like the air behind the curtain, it's not what you hear directly, but it’s what makes everything else possible!