Sinus Squeeze Prevention and Treatment for San Diego Freedivers

Sinus squeeze is one of the most painful barotrauma injuries a freediver can experience, and it’s entirely preventable. If you’re diving the cold waters off Point Loma, Sunset Cliffs, or La Jolla Cove, understanding this condition—and how to avoid it—is non-negotiable.

What Is Sinus Squeeze?

Sinus squeeze occurs when pressure changes during descent trap air in your sinuses, creating a painful vacuum that can damage delicate sinus tissue and blood vessels. Unlike ear squeeze, which you can equalize by pinching your nose, sinus squeeze happens after you’ve already descended and air pockets become isolated. The deeper you go, the greater the pressure differential, and the more severe the squeeze.

San Diego’s popular freediving spots—from the kelp forests of Torrey Pines to the deeper reefs at Bird Rock—expose divers to rapid pressure changes. Cold water temperatures also trigger sinus congestion, making the problem worse.

Why San Diego Freedivers Are at Higher Risk

Our winter and early spring water temperatures (50–55°F at depth) cause vasoconstriction and sinus inflammation. Add a head cold, allergies, or chronic sinus issues, and you’re setting yourself up for trouble. Even minor congestion becomes a major problem at 30+ meters.

The pressure gradient is steep in San Diego’s dive sites. You can descend 10 meters in seconds, and your sinuses won’t equalize as naturally as your ears do. This is especially true if you’re diving with a wetsuit hood that creates additional pressure on your face and sinuses.

Prevention: The Gold Standard

Stay healthy. Don’t dive if you have active sinus congestion, a head cold, or significant allergies. A 2–3 day delay is worth avoiding weeks of pain and potential complications. Check your sinus status before every session, especially during San Diego’s fall and winter season when colds circulate.

Equalize early and often. Begin equalizing your sinuses before you feel pressure. Use gentle, passive equalization—think of it as allowing air to flow naturally into your sinuses rather than forcing it. The Valsalva maneuver (pinching your nose and gently blowing) works for ears, but for sinuses, gentleness is key. Many freedivers miss this and only address ears.

Control your descent rate. Slow, controlled descents give your sinuses time to adapt naturally. In San Diego’s clear water, there’s no reason to rush. A 30-second descent to 20 meters is far safer than a 10-second drop. If you feel pressure building, stop and hover for a few seconds before continuing.

Use saline rinses. The night before and morning of a dive, rinse your sinuses with a neti pot or saline spray. This clears mucus and reduces inflammation. Many San Diego freedivers swear by this ritual, especially during winter months.

Avoid decongestants and antihistamines. These drugs mask congestion without fixing it—you’ll feel fine on the surface, then suffer at depth. Skip them before diving.

Warm up before diving. Cold-induced sinus constriction is real. A hot shower before heading to La Jolla or Pacific Beach helps. Stay warm on the boat or shore until your last-minute entry.

Treatment: What to Do If It Happens

If you experience sinus squeeze—typically a sharp pain in your forehead, cheeks, or between your eyes—ascend immediately and stop diving for the day. Don’t push through it.

On the surface:

• Avoid forceful nose blowing for 24–48 hours.
• Ice the area for 15 minutes at a time to reduce inflammation.
• Take ibuprofen to manage pain and inflammation.
• Rinse sinuses gently with warm saline solution.
• Rest and avoid strenuous activity.

When to seek medical help: If you experience severe pain, nosebleeds, or symptoms that don’t improve within 48 hours, see a doctor. Sinus squeeze can occasionally lead to infection or other complications, though this is rare.

Most mild to moderate sinus squeeze resolves within 3–5 days. Severe cases may take longer. Don’t return to diving until you’re completely symptom-free and have confirmed with a healthcare provider that you’re cleared.

San Diego-Specific Timing

Winter (December–February) brings colder water and higher congestion rates. If you’re new to freediving or prone to sinus issues, consider diving in warmer months (July–September) while you develop equalization skills and gauge your personal risk factors. Late spring and early fall offer a sweet spot: water temps around 60–62°F and fewer seasonal illnesses.

The Bottom Line

Sinus squeeze is painful, but it’s almost always preventable. Respect your body’s signals, dive only when healthy, equalize early and often, and control your descent. San Diego’s incredible freediving sites—from the kelp beds of Birch Aquarium to the pristine reefs of Coronado Islands—will be there when you’re ready to dive safely.

Track water temperature, sinus health, and dive conditions with Element to plan your sessions around optimal safety windows. Your sinuses will thank you.