Barotrauma is tissue damage caused by a difference in pressure between an air-filled space in your body and the surrounding environment. It most commonly affects the ears, but it can also occur in the sinuses, teeth, and lungs. The underlying physics is simple: the volume of a gas is inversely proportional to the pressure acting on it. When outside pressure changes rapidly, trapped gas in your body cavities expands or compresses, and the surrounding tissue absorbs that force.
You can experience barotrauma while flying, scuba diving, driving through mountains, or even riding a fast elevator. In a medical setting, it can happen to patients on a ventilator. The severity ranges from mild ear discomfort that resolves in minutes to serious lung injuries that require emergency care.
How Pressure Changes Cause Injury
Your body has several air-filled spaces: the middle ear, sinuses, and lungs. Normally, these spaces equalize pressure with the outside world through small openings. The middle ear does this through the Eustachian tube, a narrow passage connecting to the back of your throat. Your sinuses drain through small channels into the nasal cavity. Your lungs equalize simply by breathing.
Problems start when these pathways are blocked or when pressure changes too quickly for the body to keep up. As outside pressure rises (during descent in a plane or a dive underwater), any trapped gas compresses and the surrounding tissue gets pulled inward. As outside pressure drops (during ascent), trapped gas expands and pushes outward. Either direction can cause damage, but the location and type of injury differ.
Ear Barotrauma: The Most Common Type
Ear barotrauma is by far the most frequent form. An estimated 10% of adults and 22% of children show visible eardrum changes after a commercial flight. One study found that 20% of adult and 40% of child passengers had negative pressure built up in the middle ear after landing. Most of these cases are mild and resolve on their own, but the numbers show just how common the problem is.
The symptoms follow a predictable progression. First you notice a feeling of fullness or dullness in the ear. If pressure keeps building without equalization, that fullness turns into discomfort, then sharp pain. Fluid or blood can collect behind the eardrum, causing temporary hearing loss. In the most severe cases, the eardrum ruptures. People who experience a rupture often describe worsening pain followed by sudden relief, along with some degree of hearing loss.
Inner ear barotrauma is less common but more serious. When the pressure difference damages the delicate structures deeper in the ear, symptoms can include ringing (tinnitus), heightened sensitivity to sound, vertigo, nausea, and vomiting. Gait instability and involuntary eye movements may also develop. These injuries sometimes lead to a perilymphatic fistula, a tear in the thin membrane separating the middle and inner ear, which can cause lasting hearing or balance problems.
How Severity Is Graded
Doctors classify ear barotrauma on a five-point scale called the Teed grading system:
- Grade 0: Normal eardrum, no injury
- Grade 1: Eardrum pulled inward with redness along the central bone
- Grade 2: Redness across the entire eardrum
- Grade 3: Fluid or blood visible behind the eardrum
- Grade 4: Eardrum perforation
Grades 1 and 2 typically resolve without treatment. Grade 3 may require monitoring to ensure the fluid clears. Grade 4 often heals on its own over weeks, though some perforations need surgical repair.
Sinus and Dental Barotrauma
Your sinuses are air-filled cavities in the bones of your face, and they’re vulnerable to the same pressure dynamics as your ears. Sinus barotrauma (sometimes called barosinusitis) usually develops when the sinus drainage pathways are already narrowed by a cold, allergies, or chronic sinusitis. The result is headache, facial numbness, or pain in the upper back teeth, since the roots of those teeth sit very close to the floor of the maxillary sinus.
Teeth themselves can also be affected. Barodontalgia, or dental barotrauma, happens when air is trapped inside a tooth that has decay, a failing filling, or an inflamed nerve. The pain can be sharp on ascent, dull on descent, or severe and persistent, depending on the underlying dental condition. Divers, pilots, and frequent fliers with untreated dental problems are most at risk.
Pulmonary Barotrauma
Lung barotrauma occurs when air escapes from ruptured air sacs into the surrounding tissue. In everyday life, this most commonly happens to scuba divers who hold their breath during ascent, allowing expanding gas to over-inflate the lungs. In hospitals, it’s a known complication of mechanical ventilation, where a machine delivers air under positive pressure.
The escaped air can travel to several places, each producing a different condition: it can collect between the lung and chest wall (pneumothorax), spread into the tissue around the heart (pneumomediastinum), accumulate under the skin of the chest and neck (subcutaneous emphysema), or even reach the abdominal cavity. Subcutaneous emphysema produces a distinctive crackling sensation when you press on the affected skin.
The incidence of barotrauma during mechanical ventilation varies widely depending on the patient’s underlying condition, ranging from less than 1% to as high as 50% in older studies. Since the adoption of lower-volume ventilation strategies in the mid-2000s, the rate has generally dropped to around 10% or less. Patients with chronic lung diseases like emphysema, asthma, or interstitial lung disease face higher risk, as do those with acute respiratory distress syndrome (ARDS). During the COVID-19 pandemic, ARDS caused by the virus was identified as an independent risk factor for ventilator-related barotrauma.
How to Prevent Ear and Sinus Barotrauma
For most people, barotrauma prevention comes down to helping your ears and sinuses equalize pressure. Three techniques are widely used:
- Valsalva maneuver: Close your mouth, pinch your nose shut, and gently blow as if inflating a balloon. This forces air up through the Eustachian tubes into the middle ear. It’s the most commonly taught method, though it requires using your hands and should be done gently to avoid creating too much pressure.
- Toynbee maneuver: Simply swallow with your nose pinched closed. Swallowing compresses air against the Eustachian tubes using your tongue movement. This is often more effective during descent, when the tubes tend to resist opening.
- Frenzel maneuver: With your mouth and nose closed, make the sound of the letter “K” in the back of your throat. This compresses air in your upper throat and pushes it into both Eustachian tubes. Divers favor this technique because it can be performed hands-free with a nose clip and works at any point in the breathing cycle.
Timing matters more than technique. Start equalizing early and often during pressure changes, before pain begins. On a plane, begin swallowing or performing the Valsalva maneuver as soon as descent starts, not once your ears already feel blocked. Waiting until you feel significant pressure makes equalization much harder because the pressure difference can effectively lock the Eustachian tube shut.
If you’re congested from a cold or allergies, a nasal decongestant spray used 30 minutes before descent can help shrink swollen tissue around the Eustachian tube opening. Avoid flying or diving with an active upper respiratory infection when possible, as this is one of the strongest predictors of ear barotrauma.
When Barotrauma Causes Lasting Damage
Most ear barotrauma heals completely within days to weeks. Mild cases involving redness or fluid behind the eardrum resolve as the body reabsorbs the fluid and the tissue recovers. Even small eardrum perforations often close on their own within a few weeks.
The exceptions involve the inner ear. If the pressure difference damages the cochlea (the hearing organ) or the vestibular system (the balance organ), the effects can be permanent. Persistent hearing loss, chronic tinnitus, and ongoing balance problems are all possible outcomes of inner ear barotrauma. A perilymphatic fistula may require surgical repair, and even with treatment, some patients experience lasting symptoms. Anyone who develops vertigo, significant hearing loss, or ringing in the ears after a pressure change should be evaluated promptly, as early treatment improves outcomes for inner ear injuries.
Lung barotrauma ranges from minor (small amounts of air under the skin that absorb on their own) to life-threatening. A tension pneumothorax, where trapped air progressively compresses the lung and shifts the heart, requires immediate intervention. The prognosis depends entirely on how quickly the air leak is identified and how much lung tissue was involved.