Most ear barotrauma from diving or flying is preventable with technique — equalizing early, descending slowly, not diving congested — and the tinnitus to take seriously arrives with vertigo or hearing loss, the signs of inner ear injury.
Scuba divers and, to a lesser extent, airline passengers and crew share a specific tinnitus risk that has nothing to do with noise: rapid changes in ambient pressure that the middle ear can't equalize fast enough, called barotrauma.
Why pressure changes affect the ear
The middle ear is normally kept at the same pressure as the outside environment through the Eustachian tube, which briefly opens when you swallow, yawn, or actively equalize. When pressure around you changes faster than the Eustachian tube can keep up — descending in water, or during a plane's climb and descent — a pressure difference builds up across the eardrum. Mild cases cause the familiar ear-popping fullness. More significant cases can injure the eardrum, middle ear, or, in the more serious cases relevant to diving specifically, the delicate structures of the inner ear itself.
Middle ear vs. inner ear barotrauma
This distinction matters for how seriously to take the symptoms:
Middle ear barotrauma — the common version — causes ear fullness, muffled hearing, and mild discomfort, and typically resolves on its own within hours to a few days.
Inner ear barotrauma — less common, more serious, and specifically associated with diving rather than flying — happens when the pressure imbalance is severe enough to damage inner ear structures directly, sometimes tearing one of the delicate membranes (a perilymph fistula). This version is far more likely to cause tinnitus, along with vertigo, dizziness, and hearing loss, and unlike ordinary middle ear barotrauma, it's a medical urgency. The MSD Manual advises urgent hearing and balance testing for anyone with inner ear symptoms, and notes that prompt surgical repair of a tear in the membranes between the middle and inner ear can reverse hearing loss.
A 2014 review of the diving literature adds the other half of the picture. Once inner ear barotrauma is diagnosed, conservative management is the recommended first step, and exploratory surgery is indicated for severe or persisting balance symptoms or hearing loss, for symptoms that get worse, or for no improvement over 10 days. The same review notes that inner ear barotrauma can be hard to tell apart from inner ear decompression sickness, which is one more reason the assessment belongs with someone experienced in diving medicine.
Warning signs that need prompt evaluation, not "wait and see"
- Vertigo or a spinning sensation during or after a dive or flight
- Tinnitus that appears alongside hearing loss, rather than fullness alone
- Fluid or blood draining from the ear
- Hearing loss that's sudden, or that persists beyond a day or two — the same urgency that applies to any sudden hearing loss
- Symptoms severe enough to make it hard to stand or swim safely
Ordinary ear fullness that resolves within a day is common and not usually a concern. The combination above — especially vertigo plus tinnitus or hearing changes — is what warrants urgent care, since it's the pattern associated with inner ear injury rather than routine pressure discomfort.
Prevention: mostly technique, and knowing when not to dive or fly
For diving:
- Equalize early and often during descent — don't wait until you feel discomfort, actively equalize every few feet
- Descend slowly, and stop or ascend slightly if you can't equalize rather than forcing it
- Never dive with nasal congestion, a cold, or uncontrolled allergies — an inability to equalize is what causes the injury, and congestion is the most common reason equalization fails
- Don't use standard earplugs while diving — trapped air behind them can't equalize and creates its own pressure injury risk
For flying:
- Swallow, yawn, or chew gum during ascent and descent to encourage the Eustachian tube to open
- Avoid flying with a significant cold or sinus infection if you can reschedule
- Decongestants are widely suggested, and the evidence differs by type. In a double-blind trial of 150 adults with a history of ear pain when flying, oral pseudoephedrine taken 30 minutes before departure cut reported barotrauma symptoms to 34%, against 71% on placebo, while an oxymetazoline nasal spray (64%) was little more effective than placebo. Decongestants are medicines, so ask a pharmacist or doctor whether one is suitable for you before relying on it
- Specialized pressure-equalizing earplugs (different from standard hearing-protection earplugs) are marketed specifically for flying and may help some people, though good swallowing/yawning technique addresses most ordinary cases
If barotrauma-related tinnitus doesn't resolve
Tinnitus that persists after a barotrauma episode should be evaluated by an ENT, following the same general workup as any new tinnitus — a hearing test at minimum, with imaging or vestibular testing if inner ear involvement is suspected based on your symptoms.
Divers with a history of inner ear barotrauma should be assessed before returning to diving. The Divers Alert Network puts it plainly: fitness to dive requires an expert diving physician and depends on the degree of permanent damage as well as the probability of repeated injury. The 2014 review suggests a return may be possible, after informed consent, where any sensorineural hearing loss is stable and not severe, balance testing shows no vestibular involvement, high-resolution CT has excluded an anatomical predisposition to the injury, and the diver has been taught equalizing technique.