Learning to equalize pressure while diving the right way: Valsalva and Frenzel maneuvers, correct timing, and how to avoid painful ears for good.
Why does your ear suddenly hurt on descent, even just two meters underwater? The honest answer: because water pressure presses on a rigid cavity from the outside that can't adjust on its own. Middle ear barotrauma is by far the most common problem in scuba diving — and it's usually a technique issue, not bad luck.
The moment you start descending, water pressure rises fast. The air in your middle ear — a rigid bony cavity behind your eardrum — gets compressed, following Boyle's law (gas volume shrinks as pressure rises). Since your eardrum is the only flexible wall of that cavity, a noticeable vacuum forms and pulls it inward — painful even at shallow depths. The fix: actively push air through the Eustachian tube (the connection between your throat and middle ear). In this guide from the DOMISPORTS Academy, you'll learn the key techniques for equalizing pressure safely and protecting your hearing.
The good news: once you've got the technique down, equalizing becomes pure routine — a quick move every few breaths, nothing more. The bad news: get it wrong or react too late, and you risk one of the most painful and common diving injuries out there. That's why it's worth learning these basics properly before you go any deeper.
Equalizing doesn't take special gear — just the right conditions:
The best-known method, taught to nearly every beginner first: pinch your nose shut with thumb and index finger and try to gently exhale through your blocked nose with your mouth closed. This raises air pressure in your throat, and air flows through the Eustachian tube into your middle ear. Important: never hold this pressure longer than five seconds, and never force it.
The downside of Valsalva: it doesn't actively open the Eustachian tube, it just passively forces air into it. A safer, more elegant technique from freediving is the Frenzel maneuver: 1. Pinch your nose shut. 2. Close your mouth, push your tongue against the roof of your mouth as if forming a "K" or "T" sound. 3. Tense your throat muscles and push the air in the back of your throat upward. Since this uses no lung force, only small throat muscles, the injury risk is significantly lower.
The most important rule: act, don't react. Start your first equalization at the surface, before you even descend. Wait until it hurts, and it's usually already too late — once the pressure difference reaches about 90 mmHg (often reached at just over a meter deep), the Eustachian tube locks like a pressure relief valve, and equalizing becomes anatomically impossible.
Use your natural physiology: swallowing, big underwater yawns, or moving your lower jaw back and forth activate the same throat muscles that open the Eustachian tube. Often the gentlest way to close small pressure gaps.
If you feel stabbing ear pain on descent, or notice one ear "clogging up" — stop your descent immediately! Signal the problem to your buddy, ascend one to two meters until the pain fully fades, and try again. If it still won't work even at a shallower depth, abort the dive — no exceptions. Keep descending despite the pain, and your eardrum will tear, letting cold water rush into your middle ear and triggering immediate, dangerous vertigo underwater.
Prepare your body before the dive. Drink enough — a dehydrated body produces thicker mucus that can clog the tubes. Skip dairy, tobacco, and alcohol in the hours beforehand: they irritate mucous membranes and stimulate thick mucus production, which measurably makes equalization harder.
Because your middle ear is a rigid cavity. Even shallow water pressure compresses the air inside and pulls your eardrum inward — without equalizing, that hurts almost instantly.
With Valsalva, you passively force air into your ears using lung pressure; with Frenzel, you actively open the Eustachian tube using throat muscles — safer, since less pressure is involved.
Better not to. If the effect wears off mid-dive, a reverse block threatens on ascent — the expanding air can no longer escape your ear.
Pressing too hard can rupture the round window in your inner ear. The result is permanent hearing loss and severe vertigo — a medical emergency.
Ideally every 30 to 50 centimeters, starting right at the surface. Never wait until it hurts — by then, it's often too late for a gentle equalization.