Ear diseases range from mild nuisances to conditions that permanently alter hearing or balance, and they can strike any of the ear’s three main regions: the outer ear canal, the air-filled middle ear, or the fluid-filled inner ear. Some, like middle ear infections, are among the most frequent reasons children see a doctor; others, like cholesteatoma, quietly erode bone for years before anyone notices. Below are ten of the most common ear diseases, what causes each one, and the symptoms that should prompt you to pay attention.
Otitis Externa
Commonly called swimmer’s ear, otitis externa is an infection of the outer ear canal that thrives when moisture gets trapped against the skin. Bacteria, and occasionally fungi, colonize the warm, damp canal and trigger inflammation. It affects children, adolescents, and adults, and while swimming is the classic setup, anything that disrupts the ear canal’s natural protective barrier can invite trouble: cotton swab use, hearing aids, or eczema flare-ups that crack the skin lining.1PubMed Central. Acute otitis externa
The hallmark symptom is pain when you tug on your outer ear or press on the small cartilage flap in front of it. The canal often looks red and swollen, and you may see a watery or thick discharge. In more severe cases the swelling narrows the canal enough to muffle hearing on that side. Treatment usually involves antibiotic or antifungal ear drops and keeping the ear dry while it heals. A key diagnostic distinction is that otitis externa hurts with outer ear manipulation, whereas a middle ear infection typically does not.
Impacted Earwax
Earwax, or cerumen, is not a waste product; it’s a self-cleaning lubricant that traps dust and repels water. Problems start only when wax builds up faster than the ear can push it out, forming a plug that blocks the canal. In the United Kingdom alone, roughly 2.3 million people deal with cerumen problems serious enough to need medical attention, and about 4 million ears are syringed each year.2Oxford Academic (QJM: An International Journal of Medicine). Impacted cerumen: composition, production, epidemiology and management
Symptoms of impacted earwax include a feeling of fullness in the ear, muffled hearing, tinnitus, and sometimes dizziness. Older adults and people who wear hearing aids are especially prone because the normal outward migration of wax is disrupted. The most common mistake people make is trying to dig it out with a cotton swab, which tends to push the plug deeper. Safer options include over-the-counter softening drops, irrigation by a clinician, or manual removal with a curette under direct vision.
Acute Otitis Media
Acute otitis media, or AOM, is the classic middle ear infection. It usually follows a cold or upper respiratory infection: the mucous membranes swell, the eustachian tube that ventilates the middle ear gets blocked, and bacteria or viruses multiply in the trapped fluid. The eustachian tube normally opens during swallowing and yawning to equalize pressure and drain secretions, so anything that impairs that function sets the stage for infection.3Journal of Allergy and Clinical Immunology. Anatomy and physiology of eustachian tube and middle ear related to otitis media
In AOM the eardrum becomes red and bulging, and the purulent fluid behind it stiffens the eardrum and the tiny bones it connects to, noticeably reducing how well they vibrate.4PubMed Central. Comparison of eardrum mobility in acute otitis media and otitis media with effusion models The result is sharp ear pain, fever, and sometimes temporary hearing loss. Young children who cannot describe the pain may tug at the ear, become irritable, or have trouble sleeping. Most episodes resolve on their own or with a short course of antibiotics, but repeated bouts can lead to chronic complications.
Otitis Media With Effusion
Otitis media with effusion, sometimes called glue ear, is the quieter cousin of AOM. Fluid accumulates behind the eardrum without the acute pain or fever of an active infection. The effusion is typically serous rather than purulent, and the eardrum and middle ear lining are less thickened than in AOM.4PubMed Central. Comparison of eardrum mobility in acute otitis media and otitis media with effusion models Clinical guidelines emphasize pneumatic otoscopy as the primary way to distinguish OME from AOM, because the management paths are quite different.5PubMed. Clinical practice guideline: Otitis media with effusion
The main symptom is muffled hearing, which in children can be mistaken for inattention or behavioral problems. You may also feel fullness or popping in the ear. OME often follows an ear infection or an upper respiratory illness and clears within a few months. When it persists, especially in young children where it can interfere with speech development, doctors may recommend ventilation tubes inserted through the eardrum to keep the middle ear aired out.
Cholesteatoma
A cholesteatoma is an abnormal, noncancerous skin growth that forms in the middle ear, usually behind the eardrum. It can develop after repeated ear infections or eustachian tube problems cause part of the eardrum to retract inward, creating a pocket where dead skin cells accumulate rather than shedding normally. Over time, this growing sac can erode the delicate bones of the middle ear and even the surrounding skull bone.
The bone destruction is driven in part by inflammatory molecules. Research shows that a protein called TNF-α both erodes bone directly and triggers the release of enzymes that break down the bone’s collagen framework.6The Journal of Laryngology & Otology. Clinical and biochemical studies of bone destruction in cholesteatoma Symptoms often creep in gradually: persistent, foul-smelling ear discharge is the most common early sign, followed by progressive hearing loss on the affected side. If left untreated, a cholesteatoma can cause dizziness, facial nerve weakness, and in rare cases, life-threatening infections that spread to the brain. Surgery is the only definitive treatment, and follow-up imaging is usually necessary because these growths tend to recur.
Otosclerosis
Otosclerosis is a bone disorder unique to the ear. Abnormal bone remodeling in the tiny capsule of bone surrounding the inner ear gradually locks the stapes, the smallest bone in the body, in place where it meets the oval window of the inner ear.7PubMed. Pathology of otosclerosis: a review The stapes normally vibrates freely to transmit sound into the fluid-filled cochlea, so when it stiffens, the result is conductive hearing loss that worsens over time. It is the most common cause of this type of hearing loss in young to middle-aged adults.8PubMed Central. The Stapes in Otosclerosis: Osteoarthritis of an Ear Ossicle
Otosclerosis tends to run in families, and it affects women somewhat more often than men. The hearing loss usually starts in one ear and eventually involves both. Many people first notice they hear better in noisy environments than quiet ones, because background noise masks the frequencies they are losing. Tinnitus is a common accompanying complaint. Treatment options include hearing aids for mild cases and a surgical procedure called a stapedectomy, in which the immobilized stapes is replaced with a tiny prosthesis to restore sound transmission.
Ménière’s Disease
Ménière’s disease is an inner ear disorder defined by episodes of vertigo, fluctuating hearing loss, tinnitus, and a sense of pressure or fullness in the affected ear. Its hallmark is endolymphatic hydrops, an excess buildup of the fluid called endolymph inside the inner ear that damages the ganglion cells responsible for hearing and balance signaling.9Nature Reviews Disease Primers. Meniere’s disease The relationship between the fluid buildup and the actual attacks remains surprisingly murky: some people accumulate substantial amounts of excess endolymph before ever developing symptoms, while others become symptomatic early on.10PubMed Central. Endolymphatic hydrops: pathophysiology and experimental models
Attacks of vertigo can be incapacitating, lasting anywhere from twenty minutes to several hours, often accompanied by nausea. Hearing loss in Ménière’s disease typically affects lower frequencies first, which is unusual compared with most other forms of hearing loss. Between attacks, hearing may partially recover early in the disease, but over years the loss tends to become permanent. Some patients present with only the vestibular symptoms or only the hearing symptoms, rather than the full combination at once.11PubMed Central. What is Menière’s disease? A contemporary re-evaluation of endolymphatic hydrops Management focuses on reducing the frequency and severity of episodes through dietary salt restriction, diuretics, and sometimes injections of medication directly into the middle ear.
Benign Paroxysmal Positional Vertigo
BPPV is the most common cause of vertigo, and its mechanism is almost comically simple compared with other inner ear diseases. Tiny calcium carbonate crystals called otoconia normally sit on a gel-like membrane inside the inner ear, where they help you sense gravity and linear motion. When these crystals break loose and drift into one of the semicircular canals, they slosh around with head movements and send wildly inaccurate signals to the brain.12PubMed Central. A mouse model for benign paroxysmal positional vertigo with genetic predisposition for displaced otoconia
The result is brief but intense spinning triggered by specific head positions: rolling over in bed, looking up at a shelf, or tilting your head back in a dentist’s chair. Each episode usually lasts less than a minute, but nausea and unsteadiness can linger. The posterior semicircular canal is involved most often, partly because of how it sits relative to gravity when you’re upright.13Frontiers in Neurology. The spatial orientation of crista ampullaris: implications for BPPV diagnosis and treatment The good news is that BPPV responds well to repositioning maneuvers performed by a clinician or even at home. These guided head movements coax the loose crystals out of the canal and back to where they belong. Episodes can recur, especially in older adults, but they rarely signal anything dangerous.
Tinnitus
Tinnitus is the perception of sound when there is no external source producing it. People describe ringing, buzzing, hissing, or clicking, and it can be constant or intermittent, in one ear or both. Though it is sometimes classified as a symptom rather than a standalone disease, chronic tinnitus affects daily life for millions of people and is closely studied as a condition in its own right.
The generators of tinnitus can sit anywhere along the auditory pathway, from the ear itself up to the brain. In the inner ear, damage to the outer hair cells from noise exposure, aging, or ototoxic drugs reduces the normal signal going to the brain. The brain’s auditory processing centers then compensate by turning up their own activity, resulting in phantom sound.14PubMed Central. Tinnitus: Maladaptive auditory-somatosensory plasticity Central mechanisms involving parts of the brainstem and even the limbic system, which governs emotion, have also been implicated, which helps explain why stress and anxiety so often make tinnitus worse.15PubMed Central. Tinnitus: characteristics, causes, mechanisms, and treatments
There is no cure for most cases of chronic tinnitus, but management strategies can substantially reduce its impact. Sound therapy uses external noise to partially mask the phantom sound. Cognitive behavioral therapy helps people change their emotional reaction to the ringing, making it less distressing over time. Hearing aids often help when tinnitus accompanies hearing loss, because amplifying real sounds reduces the brain’s tendency to fill the silence.
Vestibular Schwannoma
Vestibular schwannoma, commonly called acoustic neuroma, is a benign tumor that grows on the nerve connecting the inner ear to the brain. It arises from Schwann cells, which form the insulating sheath around the nerve, and while it is not cancerous, its growth in a confined space means it can press on surrounding structures and cause real harm.16PubMed Central. Vestibular Schwannoma: What We Know and Where We are Heading
The earliest symptom is usually gradual hearing loss in one ear, often accompanied by tinnitus on the same side. Because the tumor grows slowly, people sometimes attribute the changes to aging or earwax and delay seeking evaluation. As the tumor enlarges it can affect the balance portion of the nerve, causing unsteadiness, and if it grows large enough to contact the facial nerve, facial numbness or weakness can follow. Treatment options range from watchful waiting with regular imaging for small, slow-growing tumors, to microsurgery or focused radiation for larger ones.
When Ear Pain Does Not Come From the Ear
One of the trickier aspects of ear complaints is that the pain you feel in your ear may originate somewhere else entirely. Referred otalgia accounts for a significant portion of ear pain cases. Several cranial nerves and upper spinal nerves supply the ear, and irritation along any of those pathways can produce pain that seems to come from the ear canal or deep inside the ear. Jaw joint problems, dental infections, throat conditions, and cervical spine issues are common culprits.17PubMed. Differential diagnosis of otalgia If an ear exam turns up nothing abnormal, your doctor may look at the jaw, teeth, throat, or neck before deciding the ear is at fault.
How Noise and Drugs Damage the Inner Ear
Several of the conditions above share a common thread: damage to the hair cells of the inner ear. These microscopic cells convert sound vibrations into electrical signals, and in humans they do not regenerate once destroyed. Loud noise, aging, certain genetic factors, and ototoxic medications all contribute to hair cell loss.18PubMed Central. Mechanisms of Hair Cell Damage and Repair
Noise damage is particularly well studied. Intense sound causes a calcium overload inside the outer hair cells, which triggers a chain of events leading the cell to self-destruct.19PubMed Central. A BAD link to mitochondrial cell death in the cochlea of mice with noise-induced hearing loss Ototoxic drugs like certain aminoglycoside antibiotics and the chemotherapy drug cisplatin cause a strikingly similar kind of damage, generating reactive oxygen species in the inner ear that push hair cells down the same self-destruction pathways.20PubMed. Ototoxicity: mechanisms of cochlear impairment and its prevention This overlap has actually been useful for researchers: understanding one form of damage has helped clarify the others, and experimental protective strategies being tested in animal models target these shared pathways.
Age-Related Hearing Loss
Presbycusis, or age-related hearing loss, is the single most common form of hearing impairment worldwide. It is not one disease but a convergence of wear and tear on the ear over decades. Contributing factors include accumulated noise exposure, reduced blood supply to the inner ear, mitochondrial DNA mutations, genetic susceptibility, and systemic conditions like high blood pressure and diabetes.21PubMed Central. Pathophysiology of age-related hearing loss (peripheral and central)
At the cellular level, the outer hair cells in the cochlea gradually die off through several overlapping pathways. Research in aging mice and other animals has shown that both classic programmed cell death and additional enzyme-driven destruction pathways are active at the same time, suggesting the ear is under assault from multiple directions as it ages.22Frontiers in Cellular Neuroscience. Age-related hearing impairment and the triad of acquired hearing loss The hearing loss typically starts in the high frequencies and creeps downward over years, which is why many older adults report that they can hear people talking but can’t make out the words, especially in a noisy room. Hearing aids remain the primary intervention, and fitting them sooner rather than later appears to help the brain stay adapted to processing speech.
Autoimmune Inner Ear Disease
When the body’s immune system mistakenly attacks the inner ear, the result is autoimmune inner ear disease. It is rare, but it is one of the few causes of hearing loss that can actually be reversed if caught in time. The hallmark is rapidly progressive hearing loss developing over weeks to months, typically starting in one ear before eventually affecting both.23PubMed Central. Autoimmune inner ear disease (AIED): A diagnostic challenge In most cases, patients show a bilateral and asymmetric pattern of hearing loss. About half also experience vestibular symptoms like dizziness or episodic vertigo, and tinnitus and a sense of ear fullness are present in a quarter to half of cases.
Diagnosing AIED is notoriously difficult because there is no single definitive test. Doctors often suspect it when hearing loss progresses too quickly for other explanations and improves with a trial of high-dose corticosteroids, which is also the first-line treatment.24PubMed Central. Autoimmune Inner Ear Disease from a Rheumatologic Perspective AIED sometimes accompanies other autoimmune conditions like rheumatoid arthritis or lupus, so unexplained hearing loss in someone already managing an autoimmune disease deserves prompt evaluation.25PubMed Central. Investigating the Process of Autoimmune Inner Ear Disease: Unveiling the Intricacies of Pathogenesis and Therapeutic Strategies
Ramsay Hunt Syndrome
Most people know varicella-zoster virus as the cause of chickenpox. After the initial infection resolves, the virus retreats into nerve cells and can reactivate decades later. When it flares in the nerve that supplies the ear and parts of the face, the result is Ramsay Hunt syndrome. It presents as a painful vesicular rash on or around the ear, sometimes extending into the mouth, combined with facial paralysis on the same side and ear pain.26PubMed Central. Ramsay Hunt Syndrome: An Introduction, Signs and Symptoms, and Treatment
The facial weakness in Ramsay Hunt syndrome tends to be more severe and slower to recover than in Bell’s palsy, which involves the same nerve but without the viral rash. Hearing loss, tinnitus, and vertigo can all accompany the facial symptoms because the affected nerve passes so close to the inner ear structures.27PubMed Central. Ramsay Hunt Syndrome: A diagnostic dilemma Treatment with antiviral medications and corticosteroids is most effective when started within the first few days of symptom onset. The rash is the diagnostic giveaway, but it does not always appear before the facial paralysis does, which can lead to initial misdiagnosis.