Freediving Sinus Barotrauma: Prevention and Treatment in SoCal Waters

Sinus barotrauma is one of the most common pressure-related injuries in freediving, and it’s entirely preventable with proper technique and awareness. If you’re training at Sunset Cliffs, La Jolla Cove, or anywhere along the San Diego coast, understanding how to equalize sinus pressure will keep you diving safely and comfortably.

What Is Sinus Barotrauma?

Sinus barotrauma occurs when pressure changes during descent and ascent prevent your paranasal sinuses from equalizing with ambient pressure. Your sinuses—cavities in your forehead, cheeks, and around your eyes—are air-filled spaces connected to your nasal passages. As you descend, external pressure increases, and if that air can’t escape or adjust, a pressure differential develops. This creates suction on the sinus lining, potentially causing pain, bleeding, or inflammation.

Unlike eustachian tube barotrauma (the most common type), sinus barotrauma doesn’t always announce itself during the dive. You might surface from a session at Bird Rock and feel fine, only to develop congestion, facial pain, or sinus pressure hours later.

Prevention: Equalization Starts Before You Enter the Water

Clear Your Sinuses Before Diving

The best prevention is ensuring your sinuses are patent (open and clear) before you get in. If you’re congested—whether from allergies, a cold, or San Diego’s marine layer—consider postponing your dive. Diving with blocked sinuses is the fastest path to barotrauma.

Use saline rinse or gentle neti pot irrigation 30–60 minutes before your session. This clears mucus and helps your sinuses remain open during pressure changes. Avoid antihistamines or decongestants; they can mask symptoms and create a false sense of security.

Descend Slowly and Equalize Proactively

During descent, don’t wait until you feel pressure to equalize. Start equalization within the first meter and continue every meter or so. The shallower you are, the easier equalization is. Many freedivers make the mistake of descending too quickly, then struggling to equalize at depth where pressure gradients are steeper.

At Torrey Pines or the kelp forests off Point Loma, you’ll often encounter thermoclines that can trigger sinus congestion. Slow, deliberate descents with frequent equalization prevent this from escalating.

Know Your Limits

Your maximum safe depth isn’t just about blackout risk—it’s also about your ability to equalize comfortably. If you can’t equalize without forcing or feeling pain, you’ve exceeded your current limit. Sinus barotrauma often signals that you’re pushing too deep too fast. Respect that signal.

Equalization Techniques

Passive Equalization

As you descend, gently pinch your nose and blow air into your nasal cavity. This is the Valsalva maneuver, and it’s the most common technique. The key word is gently—don’t force air. If you feel resistance, stop and ascend slightly before trying again.

Frenzel Maneuver

The Frenzel is a more advanced technique that many experienced freedivers prefer because it doesn’t require exhaled air. You close your glottis (the opening to your windpipe), then use your tongue to push air from your mouth into your nasal passages. It takes practice but reduces the risk of over-pressurization.

Toynbee Maneuver

Pinch your nose, close your mouth, and swallow. This can help equalize passively, especially useful for minor adjustments during a dive.

If Barotrauma Occurs: Treatment and Recovery

Immediate Response

If you surface with sharp sinus pain, facial pressure, or notice blood in your mucus, don’t dismiss it. Mild cases resolve within hours or days with conservative care:

• Apply warm compresses to your sinuses (cheeks and forehead)
• Rest and avoid strenuous activity for 24–48 hours
• Use saline rinse to keep passages clear
• Stay hydrated
• Avoid flying or additional diving until symptoms resolve

When to Seek Medical Attention

Persistent pain, fever, visual changes, or swelling around the eyes warrant a visit to urgent care. San Diego has excellent dive medicine specialists—if symptoms don’t improve within 48 hours, get checked out. Untreated barotrauma can lead to sinus infections or more serious complications.

San Diego-Specific Considerations

Our cold-water season (October through April) brings denser, more viscous nasal secretions. If you’re diving the reefs at La Jolla Shores or exploring wreck sites, congestion is more likely in winter. Warm-water months (July–September) are forgiving, but summer swells can create choppy conditions that distract from proper equalization focus.

Train Smart, Dive Longer

Sinus barotrauma is a reminder that freediving requires respect for physiology. Prevention through clear sinuses, slow descents, and consistent equalization will keep you comfortable and safe. Use the Element app to monitor swell, water temperature, and visibility—better conditions mean better focus on technique, not just on pushing depth records.

Start shallow, equalize often, and ascend if anything feels wrong. The ocean will be there tomorrow.