Ear Infections: How to Recognize and Treat Them

Ear infections are one of the most common reasons I see adults and children in my practice, and they are not all the same. An infection can affect the outer ear canal, the middle ear behind the eardrum, or, more rarely, the inner ear, and each type has different causes, symptoms, and treatments. Knowing which part of the ear is involved, whether it's contagious, what happens if it's left alone, and how it's actually diagnosed are the questions I get asked most, usually right after a patient has already tried waiting it out and the pain hasn't budged. For persistent or severe symptoms, seeing an ear pain specialist can help identify the cause and determine the right treatment.

Adults tend to assume ear infections are a childhood problem, which leads to real confusion when the symptoms show up later in life, especially after swimming, a cold, or a flare-up of allergies. In my experience, the type of infection changes the entire conversation: what caused it, how I diagnose it, whether it can spread to someone else, and what happens if it's left untreated for too long.

In this guide, I'll cover the different types of ear infections, what causes them, whether they spread from person to person, what happens if one goes untreated, how I actually diagnose them, and whether they can cause a headache. It is part of our complete guide to ear, nose, throat, and allergy conditions, and it is educational information rather than a substitute for an in-person evaluation.

Inner, middle, or outer: which ear infection is it?

An ear infection is classified by where it occurs: the outer ear canal, the middle ear, or the inner ear. These are genuinely different conditions, which is why getting an accurate diagnosis matters before treatment.

Outer ear infection (otitis externa, or "swimmer's ear"). This affects the ear canal between the outer ear and the eardrum. It's a bacterial infection typically caused by water that stays trapped in the ear canal, which wears down protective wax and skin and lets bacteria multiply. Frequent swimming, humidity, and earbud use raise the risk, which is why I see it so often here in a warm, water-oriented climate like South Florida.

Middle ear infection (otitis media). This affects the air-filled space behind the eardrum. It usually begins with a cold or other upper respiratory illness: the eustachian tube that connects the middle ear to the back of the nose becomes swollen and blocked, fluid builds up, and that fluid becomes a breeding ground for viruses or bacteria. The CDC notes middle ear infections are common and distinct from swimmer's ear.

Inner ear problems. True inner ear infections are uncommon. Symptoms often attributed to an "inner ear infection," dizziness, vertigo, or balance disturbance, are usually caused by inflammation of the inner ear or its nerves (such as labyrinthitis or vestibular neuritis) rather than a typical bacterial infection. Because these overlap with other ear and balance conditions, I always want to see these patients for a professional evaluation.

The simplest way I explain telling an outer from a middle ear infection: outer ear infections usually hurt when you tug the ear and rarely cause fever, while middle ear infections tend to cause deeper, constant pain, a muffled feeling, and are more likely to come with fever or cold symptoms.

Not sure which type you have? A quick exam can identify the source of the problem. Request an Appointment with Parkland Sinus & Allergy.

What causes ear infections

Ear infections have different triggers depending on which part of the ear is affected. In short: outer ear infections are usually driven by trapped moisture, and middle ear infections are usually driven by congestion that blocks normal drainage.

Outer ear infections (swimmer's ear) develop when the protective barrier of the ear canal breaks down, most often from water exposure, but also from scratching the canal, aggressive cleaning with cotton swabs, or skin conditions such as eczema. Once that barrier is compromised, bacteria or fungi can take hold.

Middle ear infections usually follow a cold, the flu, allergies, or a sinus infection. When the eustachian tube becomes inflamed and blocked, fluid cannot drain from the middle ear and pressure builds. This is also where allergies play a larger role than most patients expect: ongoing nasal and sinus inflammation from untreated allergies can keep the eustachian tube swollen and set the stage for repeated infections. It's a good example of why I treat the ear, nose, and throat as one connected system rather than in isolation.

The most common bacteria behind middle ear infections are Streptococcus pneumoniae, Haemophilus influenzae, and Moraxella catarrhalis, the same organisms that often follow upper respiratory infections.

Are ear infections contagious?

Not directly, but what caused them often is. The fluid buildup and infection inside a blocked middle ear isn't something you can catch from someone else, and swimmer's ear depends on moisture trapped in your own ear canal, not exposure to another person. What actually spreads is the upper respiratory infection, a cold, the flu, or a sinus virus, that set the ear infection in motion in the first place.

That distinction matters practically: a patient with a middle ear infection doesn't need to be isolated on the ear infection's account, but if they still have an active cold or flu underneath it, I still tell them normal precautions around that illness (hand washing, covering coughs) apply. Most people assume the ear infection itself is what's spreading when it's actually the virus that got there first.  Learn more about ear infection causes and symptoms. 

What happens if an ear infection goes untreated?

Most single ear infections improve on their own or with treatment and resolve without lasting effects. Left untreated for an extended period, especially in children, a middle ear infection can spread beyond the middle ear space and cause more serious complications.

The infection can spread into the mastoid bone behind the ear, a condition called mastoiditis, which can in turn lead to hearing loss, facial paralysis, an inner ear infection (labyrinthitis), or, in rare but serious cases, meningitis or a brain abscess. A chronically untreated infection can also damage the eardrum or the small bones of the middle ear, affecting hearing permanently rather than temporarily.

I want to be clear that these outcomes are uncommon with prompt treatment, which is exactly the point: the risk climbs with how long an infection is allowed to sit, not with the infection itself. Waiting out a mild cold at home usually isn't much of a risk. Waiting out an ear infection that isn't improving after several days, or one with worsening pain, fever, or drainage, is a different calculation, because that's the window where a contained infection can start spreading.

How I actually diagnose an ear infection

A standard outer or middle ear infection is diagnosed the straightforward way: I use an otoscope to directly examine the ear canal and eardrum, looking for redness, fluid, bulging, or drainage. No imaging is needed for most cases.

Inner ear problems work differently, and this is where "can a doctor see an inner ear infection" comes up most. The inner ear sits deep within the temporal bone, so I can't directly view it with an otoscope the way I can the eardrum. Diagnosing an inner ear issue relies on the symptom pattern (dizziness, vertigo, balance trouble), a hearing test, and a balance or neurological exam rather than a direct look.  Ear and hearing care may also be considered when symptoms point to a deeper ear problem.

When the picture is unclear, or when I suspect a complication like mastoiditis, I may order a CT scan or MRI to look at the bone and soft tissue structures around and behind the ear, not as a routine step for a typical infection, but as a targeted tool when something doesn't add up on exam. This is also where I want to set expectations about consumer "ear infection detector" tools, smartphone-attachment otoscopes and apps marketed to parents.

They can capture a photo of the eardrum, which is genuinely useful for tracking or sharing with me, but photographing the eardrum isn't the same as diagnosing what's happening in it. I treat these tools as a documentation aid at best, not a substitute for a clinical exam, and relying on one to rule an infection in or out is where patients get a false sense of certainty in either direction.

Can an ear infection cause a headache?

Indirectly, yes. Ear pain and headache show up together fairly often because the ear and surrounding structures share overlapping nerve pathways with the head. I describe this to patients as secondary, or referred, pain, where inflammation in one area is felt in a nearby one because they're wired through the same nerves. Sinusitis, colds, and TMJ disorders are common examples of conditions where head and ear pain overlap for this reason, and a spreading middle ear infection (such as mastoiditis) can cause headache directly as part of the complication itself, not just as a related symptom.

If headache is the dominant complaint and ear symptoms are mild or secondary, I'll often consider whether sinus pressure, rather than the ear, is the primary driver, since sinus and ear symptoms frequently overlap and get attributed to the wrong source. An exam helps me sort out which structure is actually driving the pain rather than treating the headache and the ear separately.

Symptoms of an ear infection

Ear infection symptoms depend on the type, but ear pain is the most common thread. The pattern of pain and the presence of fever help me distinguish an outer from a middle ear infection.

Common symptoms of an outer ear infection include:

• Ear pain that worsens when the ear is tugged or pressed

• Itchiness inside the ear canal

• Redness and swelling

• Drainage from the ear

• Usually no fever
  

Common symptoms of a middle ear infection include:

• Deeper, constant ear pain, often worse when lying down

• A muffled or plugged feeling and reduced hearing

• Fever

• Fluid drainage if the eardrum is affected

• Recent cold, congestion, or sinus symptoms
  

Symptoms sometimes attributed to an inner ear problem include dizziness, vertigo, or balance trouble, often alongside nausea. I want to see these patients promptly, especially if they come with sudden hearing loss.

What causes double ear infections

A double ear infection is an infection in both ears at the same time, and I usually find it happens because both ears share the same underlying trigger. Most often that trigger is an upper respiratory infection or an allergy flare that inflames the eustachian tubes on both sides simultaneously.

When a cold, the flu, or allergies inflame the eustachian tubes, both middle ears can lose their ability to drain at once, allowing fluid and infection to develop on both sides. Because the two ears are connected to the same nasal and sinus passages, whatever affects one side frequently affects the other. This is why I see double ear infections especially often alongside colds and allergy season.

Double ear infections tend to cause more noticeable symptoms than a single-sided infection: hearing can feel muffled in both ears, and pain and fever may be more pronounced. Recurrent double infections, in particular, are a reason I look for an underlying driver such as chronic allergies or eustachian tube dysfunction rather than treating each episode in isolation.

Dealing with ear infections that keep coming back? Recurring infections often have a root cause worth identifying. Request an Appointment to have it evaluated.

How to avoid ear infections

You can lower your risk of ear infections by keeping the ear canal dry, protecting the eustachian tube's ability to drain, and managing the colds and allergies that often start the problem. I recommend a slightly different approach for outer versus middle ear infections.

To help avoid outer ear infections (swimmer's ear), the CDC recommends:

• Keep ears as dry as possible; use a bathing cap, ear plugs, or custom swim molds when swimming

• Dry ears thoroughly after swimming or showering by tilting the head to each side to drain water

• Do not put objects in the ear canal, including cotton swabs

• Do not try to remove earwax, which protects the canal from infection

• Ask your healthcare provider about ear-drying drops (these should not be used if you have ear tubes, a punctured eardrum, or ear drainage)

  
  

To help avoid middle ear infections, I shift the focus to the nose and sinuses:

• Manage allergies proactively, since ongoing nasal inflammation is a common driver of eustachian tube dysfunction

• Treat colds and sinus congestion promptly to keep the eustachian tube draining

• Avoid tobacco smoke, which irritates the upper airway

• Stay up to date on recommended vaccinations that reduce respiratory infections

In South Florida, where year-round pollen and humidity keep nasal allergies active, I often find addressing the underlying allergy is the most effective long-term step for patients with repeated middle ear infections.

When to see me or another ENT

Most single ear infections improve, but some situations call for a professional evaluation. I recommend seeing a clinician if you have:

• Ear pain, drainage, or a plugged feeling that lasts more than a couple of days

• Ear infections that keep returning, or double ear infections

• Hearing loss, especially if it comes on suddenly

• Dizziness, vertigo, or balance problems

• High fever, severe pain, or swelling behind the ear

• Symptoms in an adult that don't clearly fit a cold or swimmer's ear

  
  

Recurring or persistent ear infections in particular are worth seeing an ENT for, because in my experience the real fix is often addressing an underlying cause, such as chronic allergies or eustachian tube dysfunction, rather than treating each episode on its own.

Adults across Coral Springs, Parkland, Plantation, and Broward County can be evaluated for ear infections and recurring ear problems at Parkland Sinus & Allergy. Request an Appointment.

Frequently asked questions

1. What is the difference between an inner and outer ear infection?

An outer ear infection (otitis externa, or swimmer's ear) affects the ear canal and usually causes pain when the ear is tugged, itchiness, and drainage, typically without fever. A true inner ear problem is uncommon and more often causes dizziness, vertigo, or balance issues rather than canal pain. Most everyday ear infections are actually outer (canal) or middle (behind the eardrum) infections.

2. Are ear infections contagious?

Not directly. The fluid buildup inside a blocked ear isn't itself contagious, but the cold, flu, or sinus virus that caused it often is. Someone with an active respiratory infection underneath the ear infection should still take normal precautions around that illness.

3. What happens if an ear infection is left untreated?

Most resolve without complications, but an untreated middle ear infection can spread to the mastoid bone (mastoiditis), damage the eardrum or middle ear bones, or, rarely, lead to more serious complications like meningitis. The risk rises the longer an infection goes unaddressed, especially if pain, fever, or drainage are worsening.

4. Can a doctor see an inner ear infection?

Not directly with a standard otoscope exam, since the inner ear sits deep within the temporal bone. Diagnosis relies on symptom pattern, a hearing test, and a balance or neurological exam, with a CT scan or MRI reserved for cases where the picture is unclear or a complication is suspected.

5. Can an ear infection cause a headache?

Indirectly, yes, through shared nerve pathways between the ear and surrounding structures, a pattern called referred pain. Spreading infections like mastoiditis can also cause headache directly. If headache is the main symptom, sinus involvement may be worth considering alongside the ear.

6. What causes double ear infections?

A double ear infection, an infection in both ears at once, usually happens when a cold, the flu, or an allergy flare inflames the eustachian tubes on both sides at the same time. Both middle ears lose the ability to drain, so fluid and infection develop in both.

7. How can I avoid ear infections?

For outer ear infections, keep your ears dry, use ear plugs when swimming, and avoid putting objects like cotton swabs in the canal. For middle ear infections, manage allergies and colds promptly so the eustachian tube can drain normally, and avoid tobacco smoke.

8. Do adults get ear infections, or only children?

Adults get ear infections too. While middle ear infections are more common in children because of their shorter eustachian tubes, adults still develop both outer and middle ear infections, particularly with swimming, allergies, colds, or sinus problems.