Both conditions involve water and the ear — but one is bone, one is bacteria, and the way they show up tells you which is which.

You step out of the water with a strange ear. Maybe it itches. Maybe it aches when you tug your earlobe. Maybe nothing hurts, but a sound has gone slightly muffled, like the volume on the world dropped by one notch. Two of the most common ear problems for water sports are easy to mix up — and the wrong assumption can cost you weeks in the water.

Surfer’s ear and swimmer’s ear sound like two flavours of the same thing. They aren’t. One is a slow, structural change to the bone of your ear canal that builds up over years of cold-water exposure. The other is a bacterial infection of the skin that flares up in days. Both can sideline you. Only one is reversible.

This post breaks down what each condition actually is, the symptoms that separate them, and the single piece of kit that prevents both before they start.

---

The Quick Answer: Bone vs Bacteria

If you only remember one thing, remember this. Surfer’s ear is a bone problem. Swimmer’s ear is a skin infection. They live in the same ear canal, they have similar-sounding names, and they affect a lot of the same people — but the cause, the timeline, and the treatment are completely different.

Surfer’s ear (medical name: exostosis) is the slow growth of new bone inside your ear canal. Cold water and wind irritate the bony part of the canal, and over years your body responds by laying down extra bone as a kind of defence. The canal narrows. Water starts trapping. Hearing dulls. By the time most people notice, the change has been building for a decade.

Swimmer’s ear (medical name: otitis externa) is a bacterial — sometimes fungal — infection of the skin lining the outer ear canal. Water sits in the canal after a swim, the skin softens, the protective barrier breaks down, and bacteria move in. Pain, redness, and discharge can appear within 24 to 48 hours of the trigger.

Both conditions share one root cause: water in the ear canal. That’s why the prevention overlaps almost entirely, even though the conditions themselves don’t.

---

Surfer’s Ear (Exostosis): The Slow Build

Surfer’s ear isn’t really about water sitting in your ear. It’s about cold water and wind hitting the bony walls of the canal, repeatedly, over years. The body interprets the chronic irritation as a threat and lays down new bone as protection. The new bone narrows the canal in slow, often symmetrical stages.

The risk scales with cold-water exposure. A surfer in Cornwall, Hossegor, Ericeira, or the Netherlands is far more at risk than someone in tropical water — but warm-water surfers aren’t immune if they’re in the ocean year-round. ENT specialists generally point to repeated exposure below about 19 °C / 67 °F as the main driver.

What makes exostosis particularly difficult to spot early is that it’s almost symptom-free until the canal has narrowed significantly. The most common early signs are:

• Water trapping more easily after a session, and being harder to shake out
• A vague sense that one ear sounds slightly muffled compared to the other
• Recurrent ear infections that didn’t used to happen
• A clogged feeling that comes and goes after surf sessions

Once exostosis is diagnosed, the bone growth itself doesn’t reverse. Mild cases can be managed with consistent ear protection and careful drying after every session. Severe narrowing — typically when the canal is more than 80% blocked — is treated surgically by an ENT, who reshapes the canal back to its original width. Recovery keeps you out of the water for several weeks. For more on diagnosis and progression, the ENT UK patient leaflet on surfer’s ear is a good starting point — and we cover the full progression in our guide to surfer’s ear and exostosis.

---

Swimmer’s Ear (Otitis Externa): The Fast Flare-Up

Swimmer’s ear is a much faster story. Water gets into the ear canal, doesn’t drain, softens the skin, and removes the slightly acidic protective layer. Bacteria — most often Pseudomonas aeruginosa — find their way in through tiny breaks in the skin and start to multiply. Within a day or two, the canal becomes red, swollen, and painful.

The classic giveaway is pain when you press on the small flap at the front of your ear (the tragus) or tug gently on the earlobe. Inner-ear or middle-ear problems generally don’t cause that. Other early signs include:

• Persistent itching deep inside the ear canal
• A dull ache that intensifies over hours, not years
• Clear or whitish discharge in the early stages
• A feeling that one ear is full or blocked
• Hearing that becomes muffled as swelling closes the canal

Mild cases sometimes settle on their own with careful drying and rest from the water. Moderate to severe cases are usually treated with prescription antibiotic or antifungal ear drops. Most people clear up within 7–10 days. Severe or untreated infections can spread, so worsening pain, fever, or swelling around the outer ear is a sign to see a clinician — the NHS guide to ear infections outlines when to act.

For a deeper look at triggers, our breakdown of why your ears itch after swimming covers the full picture of how otitis externa develops.

---

Side-by-Side: Surfer’s Ear vs Swimmer’s Ear

Here’s how the two stack up across the dimensions that matter when you’re trying to work out what’s going on.

	Surfer’s Ear (Exostosis)	Swimmer’s Ear (Otitis Externa)
What it is	New bone growth narrowing the ear canal	Bacterial or fungal infection of the canal skin
Main trigger	Repeated cold water and wind exposure	Water sitting in the canal after a swim
Timeline	Years to decades	Hours to days after exposure
Hallmark symptom	Water trapping, gradual hearing loss, recurrent infections	Pain when you push the tragus or tug the earlobe
Discharge?	Not usually	Often — clear, white, or yellow
Reversible?	Bone growth doesn’t reverse without surgery	Yes — usually clears in 7–10 days with treatment
Diagnosed by	ENT specialist via otoscope or CT	GP or ENT via otoscope and symptoms
Most at risk	Cold-water surfers, kitesurfers, wingfoilers, year-round open-water swimmers	Frequent pool swimmers, ocean swimmers, triathletes, kids

The two conditions can show up in the same person. A cold-water surfer with progressing exostosis often gets more swimmer’s ear infections, because the narrowing canal traps water more readily and gives bacteria a longer window to take hold.

---

Why Prevention Looks Almost Identical for Both

Even though the conditions are different, the prevention story converges on the same point: keep water and cold air out of the ear canal in the first place.

For surfer’s ear, the goal is to stop cold water and wind reaching the bony walls of the canal. A waterproof seal interrupts the irritation cycle that drives bone growth. Wetsuit hoods help in cold water but don’t seal the canal directly — earplugs do.

For swimmer’s ear, the goal is to stop water sitting in the canal after a session. Less water in means less softened skin, less compromised barrier, and fewer opportunities for bacteria to set up shop.

The single piece of kit that handles both jobs is a watertight earplug. The catch — and the reason a lot of surfers and swimmers stop wearing them — is that traditional plugs block all sound. For surfing in particular, that’s a non-starter. You need to hear approaching sets, other surfers, and the rhythm of the break.

SEAR earplugs are built for exactly this trade-off. The acoustic mesh reduces sound by approximately 9 dB — enough to cut wind chill and protect against the cold-water exposure that drives exostosis — without the deaf, isolated feeling of foam plugs. Three tip sizes (S/M/L) and four wing sizes (S/M/L/XL) let you find a watertight fit that holds through duck dives, flip turns, and rough open-water sessions. For a longer look at what to look for, see our guide to earplugs for surfing.

---

Habits That Help Either Way

Earplugs are the headline. A few smaller habits stack on top:

• Tilt and dry after every session. Tilt your head to each side and let gravity drain the canal before you towel off.
• Skip the cotton swabs. They strip protective earwax and create micro-tears that bacteria love. The canal is self-cleaning.
• Treat warning signs early. Itching that doesn’t settle within a day, or pain when you push the tragus, is the time to dry out the ear and rest from the water — not push through another session.
• Get an ENT check if you’ve surfed cold water for years. Exostosis is gradual; an otoscope exam can catch narrowing while it’s still mild.

---

Frequently Asked Questions

Can you have surfer’s ear and swimmer’s ear at the same time?

Yes — and it’s more common than you’d think. A narrowed canal from exostosis traps water more readily, which is exactly the condition swimmer’s ear thrives in. Cold-water surfers with progressing exostosis often have repeated otitis externa flare-ups as a knock-on effect.

Does surfer’s ear hurt?

Usually no — at least not in the early or moderate stages. Pain in or around the ear is much more typical of swimmer’s ear or another infection. Surfer’s ear tends to show up as water trapping, recurrent infections, or a gradual change in hearing rather than as direct pain. If you have ear pain, swimmer’s ear is the more likely culprit.

How fast can swimmer’s ear develop after a swim?

Often within 24 to 48 hours. The first sign is usually itching deep in the canal, followed by tenderness when you press the tragus. Catching it at the itching stage and keeping the ear dry for a few days can sometimes head off a full infection — but if pain or discharge develops, it’s worth getting it looked at.

Do you only get surfer’s ear from surfing?

No. The name is misleading. Anyone with regular cold-water and wind exposure to the ear canal can develop exostosis — including kitesurfers, wingfoilers, windsurfers, kayakers, open-water swimmers, and even cold-water swimmers who don’t use plugs. The risk factor is exposure, not the sport.

Will earplugs prevent both conditions?

A well-fitting watertight earplug is the single most effective preventative for both. It blocks the cold-water and wind exposure that drives surfer’s ear, and it stops the water sitting in the canal that causes swimmer’s ear. The fit matters more than the brand — leaks are what cause most prevention failures.

---

Protect Both Conditions With One Habit

The names sound similar, the locations overlap, and both can sideline you — but surfer’s ear and swimmer’s ear are different conditions with different timelines. Surfer’s ear builds quietly over years of cold-water exposure. Swimmer’s ear arrives within days of trapped water. The good news is that one habit prevents both: keeping water and cold air out of the ear canal every time you get in.

If you surf cold water, swim open water, or train in the pool more than a couple of times a week, ear protection is the cheapest insurance policy you can buy.

Block water. Embrace sound. Find your fit with SEAR’s waterproof earplugs for surfing and swimming — a 9 dB acoustic filter, three tip sizes, four wing sizes, and a leash that keeps both plugs with you when the set hits.

This article is for general information and isn’t a substitute for professional medical advice. If you have ear pain, persistent hearing changes, or recurring infections, see a GP or ENT specialist.