Swimmer’s ear is an infection of the ear canal, the narrow tube that runs from your outer ear to your eardrum. It typically starts with itching, progresses to significant pain, and can cause temporary hearing loss if the canal swells shut. The medical name is acute otitis externa, and while swimming is the most common trigger, anything that damages the thin skin lining your ear canal can set it off.
How Swimmer’s Ear Develops
Your ear canal has a built-in defense system. Tiny glands produce cerumen (earwax), which coats the canal with a slightly acidic, water-repellent layer. That acidity keeps bacteria and fungi from gaining a foothold. Hair follicles near the opening of the canal help trap debris before it reaches deeper tissue.
Swimmer’s ear starts when something disrupts that protective barrier. Water trapped in the ear canal after swimming is the classic cause: the moisture raises the canal’s pH, softens the skin, and washes away the protective wax layer. Once the skin is waterlogged and exposed, bacteria already present in low numbers can multiply rapidly. The two bacteria most commonly responsible are Pseudomonas aeruginosa and Staphylococcus aureus. In some cases, especially in warm, humid climates, fungi cause the infection instead.
Swimming isn’t the only culprit. Cotton swabs, fingernails, earbuds, and hearing aids can all scratch the canal lining or push wax deeper, creating the same kind of opening for infection. People who produce less earwax naturally, or who clean their ears aggressively, are more vulnerable.
What It Feels Like
The first sign is usually itching inside the ear. Within a day or two, the itch gives way to pain that worsens when you tug on your earlobe, press on the small flap of cartilage in front of the ear (called the tragus), or chew. That pain with ear manipulation is the hallmark feature that distinguishes swimmer’s ear from a middle ear infection, which produces pain deeper inside the head and doesn’t hurt when you touch the outer ear.
As the infection progresses, the ear canal swells and reddens. You may notice clear fluid draining from the ear, which can turn yellowish or greenish as the infection worsens. If swelling narrows the canal enough, sounds on that side become muffled. The ear may feel full or plugged. In more advanced cases, the pain can radiate to the side of the face or neck, and the outer ear itself may look red and swollen.
Swimmer’s Ear vs. Middle Ear Infection
These two conditions affect different parts of the ear and behave differently. A middle ear infection (otitis media) involves fluid and inflammation behind the eardrum, often follows a cold or upper respiratory infection, and is most common in young children. It frequently causes fever, and doctors diagnose it by looking at whether the eardrum is bulging or not moving normally.
Swimmer’s ear is an infection of the skin in front of the eardrum. It rarely causes fever unless it becomes severe. The simplest test you can do at home: gently pull your earlobe or press on the tragus. If that triggers or worsens the pain, swimmer’s ear is far more likely than a middle ear infection.
How It’s Treated
Topical ear drops are the standard first-line treatment. Professional guidelines specifically recommend against using oral antibiotics for uncomplicated swimmer’s ear because the infection is on the surface of the ear canal, where drops can reach it directly. Oral antibiotics are reserved for cases where the infection has spread beyond the ear canal or the patient has specific risk factors like a weakened immune system.
Your doctor will likely clean the ear canal first, removing debris and discharge so the drops can actually reach the infected skin. If the canal is too swollen for drops to penetrate, a small wick (a thin strip of compressed material) may be placed inside to draw the medication deeper. Prescription drops typically combine an antibiotic with a steroid to fight infection and reduce swelling simultaneously. A standard course runs about 7 days, with drops applied twice daily.
One important detail: if you have a hole in your eardrum or ear tubes, your doctor should prescribe a formulation that won’t damage the delicate structures of the inner ear. Make sure to mention any history of eardrum perforation or tubes before starting treatment.
During treatment, keep the ear dry. Avoid swimming, scuba diving, earbuds, and hearing aids until pain and discharge have fully stopped. Over-the-counter pain relievers can help manage discomfort in the first few days.
Recovery Timeline
Most people notice improvement within 2 to 3 days of starting drops, though the full course should be completed even if symptoms resolve early. Mild cases often clear completely within a week. More severe infections, particularly those involving significant swelling or discharge, can take 10 to 14 days to fully resolve. If pain is worsening after 48 to 72 hours of treatment, a follow-up visit is warranted because the ear canal may need to be re-cleaned or the medication may need to be changed.
When Swimmer’s Ear Becomes Dangerous
In rare cases, the infection can spread from the ear canal into the surrounding bone and tissue, a condition called malignant (necrotizing) otitis externa. This is not cancer despite the name. It’s an aggressive, deep infection that requires hospitalization and intravenous treatment.
The people at highest risk are older adults with diabetes. In one large study, nearly 75% of patients with this complication had diabetes, and the condition disproportionately affected people over age 84. Poorly controlled blood sugar impairs the immune cells that fight infection and reduces blood flow to small tissues, both of which allow bacteria to invade deeper. Warning signs include severe nighttime ear pain that doesn’t respond to standard drops, facial weakness or drooping on the affected side, and persistent drainage despite treatment.
How to Prevent It
The goal is simple: keep the ear canal dry and its natural acidity intact. After swimming or showering, tilt your head to each side and let water drain out. You can gently dry the outer ear with a towel, but avoid inserting anything into the canal.
A common preventive measure is homemade drying drops made from a 50/50 mix of rubbing alcohol and white vinegar. The alcohol evaporates residual water and kills bacteria, while the vinegar restores the canal’s acidic environment. A few drops in each ear after swimming can significantly reduce your risk. Don’t use these drops if you have ear tubes, a known eardrum perforation, or any active ear pain or drainage.
Other practical steps: use a swim cap or custom-fitted swim plugs if you’re prone to ear infections, avoid cleaning your ears with cotton swabs (which strip away protective wax and can scratch the canal), and replace earbuds regularly if you use them during exercise, since sweat and bacteria accumulate on the tips.