Why Your Ears Need
Equalization — and How
to Do It Right

If there is one skill every diver — beginner or experienced — must master before going underwater, it is ear equalization. It is the first thing your instructor will teach you, and the one technique you will use on every single dive, starting from the very first meter of descent.

This guide explains why equalization is necessary, what happens inside your ear when you dive, and how to do it correctly using the most reliable methods.

Why do your ears need to be equalized?

As you descend underwater, the weight of the water above you increases the pressure on your body. This pressure acts on every air space in your body — including your ears.

Inside your ear, behind the eardrum, is a small air-filled cavity called the middle ear. As you go deeper, rising water pressure pushes inward on your eardrum from the outside. If the pressure inside the middle ear is not brought to match the pressure outside, the eardrum gets squeezed. This creates the familiar sensation of fullness or discomfort — and if ignored, it can lead to pain, a ruptured eardrum, or a condition known as ear barotrauma.

The good news is that your body has a built-in solution: the Eustachian tube, a small canal connecting the middle ear to the back of your throat. When you equalize, you are opening this tube to allow air into the middle ear — balancing the pressure on both sides of the eardrum.

When should you equalize?

Before entering the water — do a gentle equalization on the surface to confirm your Eustachian tubes are open. As soon as you begin your descent — do not wait for discomfort. Equalize every 0.5 to 1 meter going down; small, frequent equalizations are far more effective than large, forceful ones done too late. And if you cannot equalize, ascend slightly (30–50 cm) to relieve pressure, then try again. Never force your way deeper.

The three main equalization methods

Each method in detail

Valsalva — Pinch your nose closed and gently blow through it. The blocked airflow forces air up through the Eustachian tubes into the middle ear. You should feel a soft pop or click followed by immediate relief. Use gentle pressure only — blowing too hard can over-pressurize the inner ear.

Toynbee — Pinch your nose and swallow. Swallowing naturally opens the Eustachian tubes while the pinched nose creates a mild pressure difference that guides air in. The equalization is subtler than Valsalva — sometimes less of a pop — but effective for many divers.

Frenzel — Pinch your nose, close the back of your throat as if making a “K” sound, then use your tongue and throat muscles to push air toward the Eustachian tubes. This method does not use lung pressure, which makes it significantly safer and more controlled.

Common problems and what to do

One ear equalizes, the other doesn’t. Tilt your head so the harder ear faces upward — this helps the tube drain and open. Use gentle, repeated attempts rather than force.

Equalization isn’t working at all today. Abort the dive. This is not a problem that resolves itself underwater. Attempting to descend without successful equalization is the leading cause of ear injuries in recreational diving.