Diving and Ears: Everything You Need to Know About Equalization

If you've ever been on a plane, you know that pressure feeling in your ears. Diving is the same thing, but more intense. Ear equalization is THE fundamental skill every diver needs to master. It's also one of the first things you learn in your Open Water course. Here's everything you need to understand.

Why do you need to equalize?

As you descend underwater, pressure increases. At 10 metres deep, it has already doubled compared to the surface. This pressure pushes against your eardrums, which are thin, sensitive membranes. Without equalization, the external pressure forces the eardrum inward, causing pain, discomfort, and in extreme cases, injury.

Equalization simply means sending air into the middle ear (the space behind the eardrum) via the Eustachian tubes, to balance the external pressure. It's a straightforward action, but it requires a bit of technique.

How does the Valsalva method work?

This is the technique most divers learn first. The principle: pinch your nose through the mask and blow gently. The air travels up the Eustachian tubes and equalizes the pressure. You feel a small "pop" in your ears, which means it's worked.

The trap to avoid: never blow hard. A forceful Valsalva can damage the inner ear. It should be a gentle, gradual blow, not a display of force. If it doesn't work with a gentle push, don't force it.

What is the Frenzel method and how do you use it?

The Frenzel technique uses the tongue rather than the lungs. You pinch your nose, then push the back of your tongue upward, as if you were pronouncing the letter "K". This movement sends a small amount of air into the Eustachian tubes, without any lung effort.

It's a more elegant and gentler technique than Valsalva. It takes a bit of practice on dry land (you can train at home, on the sofa), but once mastered, it makes equalization almost automatic. Many experienced divers swear by it.

What are the most common ear equalization mistakes?

The number one mistake: waiting until it hurts to equalize. You need to start early, from the very first metres of descent, and repeat frequently. Every 30 to 60 seconds, or every metre at the beginning. If you wait until pain kicks in, it's often too late: the Eustachian tubes are already compressed and won't let air through.

Second mistake: descending too fast. Take your time. A slow, controlled descent makes equalization much easier. If one ear blocks, ascend a metre or two, try again. There's absolutely no shame in taking your time. It's actually the sign of a smart diver.

Third mistake: diving with a cold or congested sinuses. Swollen mucous membranes block the Eustachian tubes. Forcing equalization in this state risks a barotrauma. If you're stuffed up on dive day, postpone. Your health comes first.

How do you prevent ear infections from diving?

Swimmer's ear (otitis externa) is an infection of the ear canal, often caused by water that stays in the ear after diving. To prevent it: dry your ears well after every dive, tilt your head to each side to drain residual water, and avoid cotton buds that irritate the canal.

Some divers use ear drops made of alcohol and white vinegar after each dive to dry out the canal and prevent infection. If you're diving several days in a row, it's a precaution well worth taking.

What if you really can't equalize?

Some people have naturally narrower Eustachian tubes, which makes equalization harder. If despite proper technique and a slow descent you still can't equalize, never force it. Ascend, try again, and if the problem persists, see an ENT specialist experienced in hyperbaric medicine. Solutions exist, but first you need to understand the root cause.

The takeaway

Ear equalization is diving 101. Start early, do it often, never force, and don't dive with a cold. With these simple rules, your ears will thank you. It's one of the first skills covered in the Open Water course, and with a little practice, it becomes as natural as breathing.

Want to learn all this in the water, with a patient instructor? Get in touch, let's chat about it.