If you can't equalize while freediving, you're not broken and you're rarely out of options — you're almost always hitting one specific, fixable cause. The usual suspects are congestion, one lagging ear, a reverse block on the way up, or a technique fault that pushing harder only makes worse. This guide walks through each cause in turn, the fix for it, and the clear signs that mean you should abort the dive or see a doctor rather than tough it out.
This troubleshooting guide pairs with our complete guide to freediving equalization; if you're not yet solid on the underlying technique, read that first, then come back here when something specific is going wrong.
First, Rule Out Congestion and Illness
Before you blame your technique, check your sinuses. A cold, allergies, or even mild congestion swells the lining of your Eustachian tubes and narrows the already-thin channel air has to travel through. On a good day you can equalize easily; congested, the same effort does nothing — and forcing it is exactly when injuries happen.
The rule is blunt: don't dive with congestion. Decongestants can mask the problem and then wear off at depth, leaving you with a reverse block on the way up. If your nose isn't clear at the surface, your ears won't clear underwater. Wait until you're genuinely healthy.
When One Ear Won't Equalize
It's common for one ear to clear instantly while the other lags. Often it's just anatomy — one Eustachian tube is slightly narrower or angled differently. A few things help: tilt your head so the stubborn ear points upward (toward the surface), which mechanically favours that tube; slow your descent right down; and equalize more frequently and more gently on that side.
If one ear consistently refuses while the other is fine, descend feet-first so you can pause and work it, and never trade a blocked ear for "just a bit deeper." A single uncooperative ear is a reason to stay shallow that session, not to force the dive.
Reverse Block: Pain on the Way Up
A reverse block is the mirror image of the usual problem: air that expanded fine on the way down can't escape on the way up, so it presses outward on your eardrum and hurts as you ascend. It's frequently caused by congestion or a decongestant wearing off, and it's more alarming than a descent block because you can't simply go back down forever to relieve it.
If you feel ascent pain, stop your ascent if you safely can, descend a metre or two to ease the pressure, and come up very slowly to give the trapped air time to vent on its own. Gentle jaw movements — swallowing, wiggling the jaw side to side — can help open the tube. Never rush the ascent to escape the pain; that only worsens the pressure difference.
Technique Problems That Block Equalization
When health isn't the issue, technique usually is. The three big ones:
- Equalizing too late. Once pressure has already pushed your eardrum inward, the Eustachian tube tends to lock. The fix is to equalize at the surface and continuously on the way down, before you feel anything.
- Head tilted back. Looking down at the bottom stretches and pinches the tubes shut. Keep your chin tucked or neutral.
- Relying on Valsalva. If you only know the chest-push method, it will fail as your lungs compress. Learning the Frenzel technique solves a huge share of "I can't equalize past X metres" complaints.
When to Abort the Dive or See a Doctor
Some signals mean the session is over. Abort the dive the moment you feel ear pain, an ear won't clear after a gentle attempt, or you feel any spinning or dizziness. Pushing past these risks a ruptured eardrum or inner-ear barotrauma.
See a doctor if you have lasting muffled hearing, fluid or blood from the ear, ongoing pain hours after the dive, or any vertigo — these can indicate barotrauma that needs proper assessment. Build your judgement around margins, not heroics; the same mindset that keeps you safe from shallow water blackout applies to your ears. A dive you abort early is always better than an injury that keeps you out of the water for months.
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