Ear Infections in Adults: Causes, Treatment and When to See an ENT

Most people think of ear infections as a childhood problem, and for good reason. But adults get them too, and when they do, the infection can feel worse than expected and the muffled hearing can hang on for weeks. This article covers how often adults get middle ear infections (acute otitis media), what sets them off, how to tell one apart from swimmer’s ear or simple fluid, how they are treated, and why an ear infection in an adult sometimes deserves a closer look than one in a child.

How Common Are Ear Infections in Adults?

Much less common than in children. In a study of U.S. insurance records from 2008 to 2014, about 500 of every 1,000 one-year-olds were seen for a middle ear infection each year. For adults aged 18 to 49 the figure was about 33 per 1,000, and it kept falling with age, to about 16 per 1,000 in people 85 and older. That makes a young or middle-aged adult roughly 15 times less likely than a toddler to need care for one in a given year.

A Dutch primary care study of more than 1.2 million person-years found an even lower rate in adults who saw their family doctor: about 5 episodes per 1,000 people each year, declining from about 7 per 1,000 in people aged 15 to 39 to under 3 per 1,000 in those 64 and older.

The main reason is anatomy. The Eustachian tube connects the middle ear to the back of the nose. It lets air in, lets fluid drain out, and helps keep germs from the nose away from the ear. In young children the tube is short, floppy and nearly flat, so germs reach the middle ear easily and fluid drains poorly. As the skull grows, the tube becomes longer and steeper, and the immune system matures. By the school years, the ear is much better protected.

What Makes an Adult More Likely to Get an Ear Infection?

In adults, an ear infection almost always has a reason behind it. Common ones include:

• A recent cold or other upper respiratory infection. This is the most common trigger. Swelling at the back of the nose blocks the Eustachian tube, fluid builds up behind the eardrum, and germs can grow in it. In a 2014 analysis of 24 studies on repeated and long-lasting ear infections, a recent upper respiratory infection raised the odds about 6.6 times.
• Allergies. Allergic swelling in the nose can block the tube the same way. In the Dutch study, adults with allergic conditions had ear infections more often (about 7 per 1,000 each year, compared with about 5 per 1,000 overall). If allergies are part of the picture, our allergy care may help.
• Sinus and nasal problems. Ongoing chronic sinusitis or a blocked nose can keep the area around the tube inflamed.
• Smoking or secondhand smoke, which irritates the lining of the nose and Eustachian tube.
• Earlier ear infections, including a history of them as a child.
• Pressure changes, such as flying or diving with a cold. Our guide to airplane ear explains how to protect your ears when you travel.

Less often, something is physically blocking the opening of the Eustachian tube at the back of the nose. That possibility is the main reason adult ear infections are handled a little differently, as explained below.

Is It a Middle Ear Infection, Swimmer’s Ear or Fluid Behind the Eardrum?

Several different problems get called an “ear infection,” and they are treated differently:

• Middle ear infection (acute otitis media): infected fluid behind the eardrum. It usually comes on over a day or so, often during or after a cold, with deep ear pain, a full feeling, muffled hearing and sometimes fever. If pressure builds enough, the eardrum can tear and the ear drains. Our article on a ruptured eardrum covers what to do if that happens.
• Swimmer’s ear (acute otitis externa): an infection of the skin of the ear canal, outside the eardrum. The hallmark, according to the American Academy of Otolaryngology–Head and Neck Surgery guideline, is pain when you press on or tug the outer ear, often with itching, swelling of the canal and drainage. It is treated with ear drops rather than antibiotics by mouth. See our guide to swimmer’s ear.
• Fluid without infection (otitis media with effusion) or Eustachian tube dysfunction: fluid or negative pressure behind the eardrum with little or no pain and no fever. It feels like a plugged, underwater ear, sometimes with crackling or popping. Our article on a clogged ear that will not unclog covers this in more detail.

These can look alike from the outside, and a red eardrum alone does not settle it. An ear exam is the only way to tell them apart, which matters because the treatment is different for each.

Can Ear Pain Come From Somewhere Other Than the Ear?

Yes, and in adults it often does. The ear shares nerves with the jaw, teeth, throat and neck, so pain that starts in those areas can be felt in the ear (referred ear pain). In a 2023 review, nearly half of all ear pain came from somewhere other than the ear, and ear pain without other ear symptoms, such as muffled hearing, fullness or drainage, strongly suggests the source is elsewhere. Common sources include:

• The jaw joint (TMJ): one of the main causes of referred ear pain. The pain sits just in front of the ear and is worse with chewing or opening wide, sometimes with clicking or a sore jaw from clenching. Hearing is usually normal.
• Teeth: an infected or cracked tooth, often a back molar.
• The throat: a sore throat or tonsil infection.
• The neck: pain behind or below the ear that changes with neck position.

Ear pain that does not go away while the ear itself looks normal should be checked by an ENT, especially if it is on one side only, lasts more than a few weeks, or comes with hoarseness, trouble or pain swallowing, a lump in the neck or unexplained weight loss. This matters more for older adults and people who smoke or drink heavily, because a cancer of the throat or voice box can first show up as ear pain. The AAO-HNS guideline on neck masses in adults advises prompt evaluation of any neck lump that persists. Our throat and voice specialists can examine the throat during the same visit.

Why Does an Adult Ear Infection Deserve a Closer Look?

Because healthy adults so rarely get middle ear fluid, a doctor will ask why it happened. Usually the answer is simple: a recent cold, allergies or a flight. But when fluid sits behind the eardrum on one side only and there is no clear cause, an ENT should look at the back of the nose, where the Eustachian tube opens.

The reason is that a growth in that area (the nasopharynx), including a cancer there, can block the tube and cause one-sided ear fluid before it causes any other symptom. Nasopharyngeal cancer is uncommon, and most adults with ear fluid turn out to have a simple cause, but it is the main thing doctors want to rule out. In a 2022 systematic review of adults with one-sided ear fluid and no obvious cause, about 5.5% (31 of 568) in the studies reviewed were found to have cancer of the nasopharynx. A normal exam of the back of the nose ruled it out in 99.65% of patients, so for most people this check is reassuring.

There is no single official guideline for how to work up lingering ear fluid in adults, and a 2026 survey of ENT specialists found that practice varies. The authors of the 2022 review proposed a practical approach: examine the back of the nose first, recheck the ear over time if the exam is normal, and order an MRI if the fluid is still there after about 8 weeks or anything looks unusual. Your ENT will tailor this to you.

See an ENT promptly if one-sided ear fluid or muffled hearing comes with any of these:

• A new lump in the neck
• Nosebleeds or blood-tinged mucus
• A blocked nose on one side that does not clear
• Numbness of the face, double vision or new, persistent headaches

Our board-certified ENTs can look at the back of the nose during an office visit as part of our ear care.

How Are Ear Infections Treated in Adults?

There is no treatment guideline written specifically for adults with middle ear infections. As the authors of the Dutch primary care study point out, the research has focused on children, so adult care draws on the pediatric evidence and on clinical experience. In general:

• Pain relief comes first. Over-the-counter pain relievers such as acetaminophen or ibuprofen ease the pain whether or not an antibiotic is used. Ask your doctor which is right for you.
• Not every infection needs an antibiotic. Many mild middle ear infections clear on their own. A doctor may prescribe an antibiotic for more severe symptoms, an infection that is not improving, or drainage from the ear. In practice, adults in the Dutch study received an antibiotic by mouth in about 46% of episodes, most often amoxicillin. If you are given one, take it exactly as prescribed, and do not use leftover antibiotics.
• Decongestants and antihistamines do not clear the fluid. The AAO-HNS guideline on fluid behind the eardrum, written for children, recommends against using them for this purpose because they do not help the fluid resolve and can cause side effects. They may still have a role if you have allergies, which is a separate question.
• Treat the trigger. If allergies, sinus disease or a blocked nose keeps setting off ear problems, treating that cause is part of preventing the next one.

How Long Does an Adult Ear Infection Take to Get Better?

The pain of a middle ear infection usually improves within a few days. The fluid takes longer. Even after the infection is gone, fluid can stay behind the eardrum and keep your hearing muffled. The AAO-HNS guideline notes that in children, most fluid that follows an ear infection clears on its own within about 3 months. Adults have been studied less, but the same pattern is common: the ear can feel plugged for several weeks after the pain is gone.

A plugged feeling that slowly improves is expected. Fluid or muffled hearing that has not cleared by about 3 months, or one-sided fluid without an obvious cause, should be rechecked, for the reasons above.

When Does an Ear Infection Need Urgent Care?

Serious complications of middle ear infections are rare in adults. A 19-year study in Italy found about 1 case of mastoiditis (infection spreading into the bone behind the ear) per 100,000 people each year, and a Finnish study found serious complications in and around the ear and brain in about 0.3 per 100,000 adults each year. The Italian authors also noted that mastoiditis in adults often develops slowly with unusual symptoms, so warning signs should never be ignored.

Get same-day care through our ENT Urgent Care if you have:

• Swelling, redness or tenderness behind the ear, or an ear that sticks out more than usual
• High fever, or a severe or worsening headache
• Spinning dizziness (vertigo) or trouble with balance
• Weakness on one side of the face
• A sudden drop in hearing. Sudden hearing loss is not always caused by fluid and needs to be seen as soon as possible, definitely within two weeks. Our article on sudden hearing loss in one ear explains why timing matters.

Call 911 or go to the ER for a stiff neck with fever, confusion, a seizure, or constant severe dizziness with stroke-like signs, such as a drooping face, arm weakness or trouble speaking.

When Should an Adult See an ENT for Ear Infections?

Schedule a visit with an ENT if you have:

• Infections that keep coming back. There is no separate official definition for adults. In children, “recurrent” usually means 3 or more infections in 6 months, or 4 or more in a year, and that is a reasonable benchmark for adults too.
• Fluid or muffled hearing that lasts about 3 months, or hearing that has not returned once the ear feels better. A hearing test can measure how much the fluid is affecting your hearing.
• One-sided fluid without a clear cause, as described above.
• A hole in the eardrum or an ear that keeps draining.

Treatment depends on the cause. Managing allergies, sinus disease or nasal blockage comes first, along with ruling out a blockage at the back of the nose. From there, options include:

• Ear tubes (tympanostomy tubes), tiny tubes placed in the eardrum to let air in and fluid out. Most of the strong evidence for tubes comes from children. A 2025 review of tubes in adults with ear fluid found more mixed results, including drainage from the tube in some patients, so the decision is made case by case.
• Eustachian tube balloon dilation, for adults whose Eustachian tube stays blocked despite medical treatment. A small balloon is passed through the nose and briefly inflated to widen the tube. In a 2026 analysis of randomized trials, adults who had balloon dilation were about 4.7 times more likely to reach a normal eardrum pressure test than those who did not. In a multicenter randomized trial, symptoms improved more with balloon dilation than with continued medical treatment, no complications were reported, and 72% of procedures were done in the office under local anesthesia. A 2025 Cochrane review rated the evidence as low certainty and called for longer-term studies. Our article on Eustachian tube balloon dilation explains the procedure in more detail.

Our board-certified ENTs see adults with ear infections and ear fluid at all four of our offices.

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