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Condition

Ear Infection: Symptoms, Causes, and Treatment

An ear infection is an inflammation or infection of the ear canal, middle ear, or inner ear. The most common type, acute otitis media, occurs when bacteria or viruses infect the space behind the eardrum. Symptoms include ear pain, pressure, muffled hearing, and sometimes fever. Mild cases often resolve without antibiotics within 2–3 days; more severe cases are treated with amoxicillin as the first-line antibiotic.

Written by Gale Editorial · grounded in the cited clinical sources below · Updated 2026-06-15. How we write.

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What Is an Ear Infection?

An ear infection is an inflammation or infection of one of three anatomical zones: the outer ear canal, the middle ear (the air-filled space behind the eardrum), or, rarely, the inner ear. The CDC recognizes three main clinical types 1:

  • Acute otitis media (AOM): Bacterial or viral infection of the middle ear — the most common type and the one most people mean when they say "ear infection."
  • Otitis media with effusion (OME): Fluid accumulates behind the eardrum without active infection. No fever or acute pain, but hearing may be muffled.
  • Otitis externa (swimmer's ear): Infection of the outer ear canal, typically from water that remains in the canal after swimming.

Although far more common in young children — roughly 80% experience at least one episode before school age 3 — ear infections occur in adults and follow the same diagnostic and treatment principles.

Symptoms by Type

Symptoms vary depending on which part of the ear is affected.

Middle ear infection (acute otitis media)

  • Ear pain — often sudden in onset and described as sharp, aching, or a deep pressure
  • A sensation of fullness or blockage in the ear
  • Muffled or reduced hearing
  • Fluid or discharge draining from the ear (particularly if the eardrum has perforated)
  • Fever — approximately two-thirds of patients with AOM present with low-grade fever 2
  • In adults: headache, general malaise, or dizziness

Otitis media with effusion

  • Muffled hearing or a feeling of "water in the ear"
  • Mild ear pressure without significant pain
  • No fever — the distinguishing feature from AOM 1

Swimmer's ear (otitis externa)

  • Itching inside the ear canal
  • Pain that worsens when the outer ear (tragus) is pulled or pressed
  • Redness, swelling, and warmth of the ear canal
  • Clear or odorous drainage from the canal 1

Causes and Risk Factors

Middle ear infections arise when the eustachian tube — the narrow passage connecting the middle ear to the back of the throat — becomes blocked by swelling or congestion. This traps fluid in the middle ear, where bacteria or viruses can multiply 2.

The three bacterial species responsible for most AOM cases are *Streptococcus pneumoniae*, non-typeable *Haemophilus influenzae*, and *Moraxella catarrhalis* 2. Viral respiratory infections (colds, flu) frequently precede AOM by creating nasopharyngeal inflammation that allows bacteria to ascend the eustachian tube 4.

Common risk factors include:

  • Recent cold, sinus infection, or allergy flare
  • Tobacco smoke exposure
  • Childcare attendance (relevant for adults with children at home)
  • Anatomical factors — the eustachian tube becomes more angled with age, which is why children under two are most susceptible 4

Swimmer's ear develops when water remaining in the outer ear canal softens and breaks down the protective skin layer, allowing bacteria — most commonly *Pseudomonas aeruginosa* or *Staphylococcus aureus* — to proliferate 1. Inserting objects like cotton swabs can also scratch the canal lining and open the same pathway.

Treatment: Antibiotics vs. Watchful Waiting

The central treatment decision for middle ear infections is whether antibiotics are needed immediately or whether watchful waiting is appropriate.

Watchful waiting is appropriate for many adults with mild AOM. The CDC notes that the immune system can often clear a middle ear infection without antibiotics 1. In European countries, watchful waiting for 48–72 hours before prescribing antibiotics is standard practice with no increase in complications 3. About two out of three children — and a similar proportion of adult patients with mild symptoms — recover without antibiotics 3.

During watchful waiting, pain management is the priority:

  • Ibuprofen or acetaminophen for ear pain and fever
  • Warm compresses applied to the affected ear

Antibiotics are indicated when:

  • Symptoms are severe (intense pain, fever above 39°C / 102.2°F)
  • Symptoms do not improve within 48–72 hours
  • Discharge is draining from the ear
  • The patient is under 2 years of age, immunocompromised, or has diabetes 2

When antibiotics are prescribed, high-dose amoxicillin is the first-line choice for non-penicillin-allergic patients 3. For those with a penicillin allergy, alternatives include azithromycin, clarithromycin, or cephalosporins such as cefdinir 2. If the initial antibiotic fails, high-dose amoxicillin–clavulanate is the next step.

Swimmer's ear is treated differently: antibiotic ear drops — often a fluoroquinolone such as ciprofloxacin — are applied directly to the outer canal. The ear canal must be kept dry during treatment. Swimmer's ear typically resolves within 7–10 days with appropriate drops 1.

Otitis media with effusion does not respond to antibiotics, decongestants, or nasal steroids; none of these hasten fluid clearance. Watchful waiting for up to three months is the standard approach 3.

How Long Does an Ear Infection Last?

Most uncomplicated middle ear infections in adults improve within 2–3 days with supportive care. Antibiotic courses run 5–10 days depending on the agent. Residual fluid behind the eardrum can persist for several weeks after acute symptoms resolve, causing continued muffling — this is normal.

Swimmer's ear clears in 7–10 days with consistent antibiotic ear drops 1.

If symptoms worsen after starting antibiotics, or a new fever develops after initial improvement, a clinician should re-evaluate.

Complications

Serious complications from acute otitis media are rare in the antibiotic era. The most common concern is temporary conductive hearing loss during the infection, which resolves once the inflammation clears 2.

Rarer complications include:

  • Tympanic membrane perforation: Pressure from fluid buildup can rupture the eardrum. Small perforations usually heal spontaneously within weeks.
  • Mastoiditis: Infection spreading to the mastoid bone behind the ear. Pre-antibiotic era rates reached 5–10%; the current rate with antibiotics and pneumococcal vaccination is fewer than 0.002% of AOM cases 5.
  • Meningitis or brain abscess: Extremely rare; more likely in immunocompromised patients or when AOM goes untreated.

Recurrent middle ear infections — typically defined as four or more episodes within 12 months — may warrant referral to an ear, nose, and throat specialist. Tympanostomy tubes (ear tubes) can allow fluid to drain and reduce the frequency of recurrences 3.

For adults with new-onset unilateral AOM or recurrent AOM without an obvious cause, ENT referral is recommended to exclude an underlying structural or systemic cause 3.

Care Pathway: Telehealth vs. In-Person

Uncomplicated adult ear infections are frequently diagnosable via telehealth. A clinician can evaluate symptom onset, character and severity of pain, fever, hearing changes, and prior treatment. If the presentation is consistent with straightforward AOM or otitis externa, a prescription can be sent to a pharmacy the same day. Telehealth visits for ear infections typically cost $30–$100, compared with $150–$280 for an in-person urgent care visit.

In-person evaluation is appropriate when:

  • Symptoms are severe or progressing rapidly
  • There is pain or swelling behind the ear (possible mastoiditis)
  • Discharge from the ear is heavy or foul-smelling
  • Hearing loss is significant or sudden
  • A child under 6 months has fever or ear pain
  • Symptoms do not improve within 48–72 hours of starting treatment 1

Generic amoxicillin, when prescribed, typically costs $4–$10 with a pharmacy discount card at most major pharmacies.

Common questions

Can an ear infection go away on its own without antibiotics?

Yes, many middle ear infections resolve without antibiotics. The CDC notes the body's immune system can often fight off the infection on its own. Watchful waiting for 48–72 hours with pain management is appropriate for adults with mild symptoms. Antibiotics are recommended if pain is severe, fever is high (above 102°F), or symptoms do not improve within 2–3 days.

What is the difference between a middle ear infection and swimmer's ear?

A middle ear infection (acute otitis media) is an infection of the air-filled space behind the eardrum, usually triggered by a cold or respiratory illness. Swimmer's ear (otitis externa) is an infection of the outer ear canal, usually caused by water remaining in the canal. Middle ear infections cause deep pain, pressure, and sometimes fever; swimmer's ear causes itching, pain when the outer ear is touched, and canal redness. They are treated differently — systemic antibiotics for middle ear infections versus topical antibiotic drops for swimmer's ear.

How long does an ear infection last in adults?

Most uncomplicated middle ear infections in adults improve within 2–3 days with supportive care or antibiotics. A full antibiotic course runs 5–10 days. Some residual fluid and muffled hearing can persist for a few weeks after symptoms resolve, which is normal. Swimmer's ear typically clears within 7–10 days of antibiotic ear drop treatment.

What is the first-line antibiotic for an ear infection?

High-dose amoxicillin is the first-line antibiotic for most adults and children with acute otitis media who are not allergic to penicillin. For those with a penicillin allergy, alternatives include azithromycin, clarithromycin, or cephalosporins such as cefdinir. If initial treatment fails, amoxicillin–clavulanate is typically the next step. Swimmer's ear is treated with topical antibiotic ear drops, not oral antibiotics.

When should an adult go to the doctor for an ear infection?

An adult should see a clinician if ear pain is severe, if there is swelling or tenderness behind the ear, if symptoms do not improve within 2–3 days, if there is significant drainage from the ear, or if hearing loss is sudden or pronounced. Adults with diabetes or a weakened immune system should seek evaluation sooner rather than waiting.

Can I get an ear infection diagnosis and treatment online?

Many uncomplicated adult ear infections can be assessed and treated through a telehealth visit. A clinician reviews symptoms, severity, and history and can prescribe antibiotics electronically. Telehealth is not a substitute when symptoms suggest a serious complication — such as pain behind the ear, high fever, or rapid hearing loss — which require in-person evaluation and sometimes imaging.

Related conditions

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Specialties

Primary Care: What a PCP Treats and When to See One

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When to seek care

  • —Swelling, redness, or pain behind the ear (possible mastoiditis — requires urgent evaluation)
  • —High fever (above 39°C / 102.2°F) that does not improve
  • —Sudden or significant hearing loss
  • —Facial weakness or asymmetry on the same side as the infected ear
  • —Severe dizziness, loss of balance, or vomiting with ear pain
  • —Heavy or foul-smelling discharge from the ear canal
  • —Symptoms worsening after 48–72 hours on antibiotics
  • —Any ear pain or fever in an infant under 6 months

Call 911 or go to the nearest emergency room if ear pain is accompanied by stiff neck, confusion, or a severe headache — these may indicate meningitis.

General health information, not medical advice. Synthetic demonstration content.

References

  1. 1.Centers for Disease Control and Prevention (2024). Ear Infection Basics. CDC.gov. link ✓Types of ear infection (AOM, OME, otitis externa), causative bacteria, and the statement that the immune system can often clear middle ear infections without antibiotics
  2. 2.Danishyar A, Ashurst JV (2023). Acute Otitis Media. StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing. link ✓Bacterial pathogens (S. pneumoniae, H. influenzae, M. catarrhalis), fever prevalence (~two-thirds of AOM cases), first-line antibiotic (amoxicillin), penicillin-allergy alternatives, and complications including mastoiditis and meningitis
  3. 3.Harmes KM, Blackwood RA, Burrows HL, Cooke JM, Harrison RV, Passamani PP (2013). Otitis Media: Diagnosis and Treatment. American Family Physician. link ✓80% of children experience at least one AOM episode; two out of three children recover without antibiotics; watchful waiting in European countries; first-line amoxicillin dosing; antibiotics/decongestants do not hasten OME clearance; recurrent AOM definition and tympanostomy tube indication
  4. 4.Schilder AGM, Bhutta MF, Butler CC, et al. (2016). Otitis media. Nature Reviews Disease Primers. doi:10.1038/nrdp.2016.63 ✓Eustachian tube anatomy and age-related susceptibility; viral URT infections as AOM precursor; global incidence of 709 million AOM episodes per year; peak incidence in children 1–4 years; bacterial biofilm formation
  5. 5.Sahi D, Callender KD (2023). Mastoiditis. StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing. link ✓Pre-antibiotic mastoiditis rate of 5–10% of AOM cases; post-antibiotic/PCV-7 rate below 0.002% of AOM cases
  6. 6.Centers for Disease Control and Prevention (2024). Preventing Swimmer's Ear. CDC Healthy Swimming. link ✓Mechanism, symptoms, and treatment of otitis externa (swimmer's ear); antibiotic ear drops as standard treatment; 7–10 day resolution timeline

https://www.gale.care/conditions/ear-infection · 6 sources. General health information, not medical advice — synthetic demonstration content.