Ringing, buzzing, or hissing in one ear that won't go away is called tinnitus, most often caused by earwax buildup, noise exposure, or a middle ear problem rather than anything dangerous. Less often, it points to an inner ear condition, a medication side effect, or, rarely, a growth on the hearing nerve. This guide covers the common causes and the signs that mean you should not wait to get checked.

1. Earwax Blockage (Cerumen Impaction)

What it is: A buildup of earwax that blocks the ear canal and muffles sound.

Why it happens: Earwax can accumulate from cotton swab use pushing it deeper, frequent earbud or hearing aid use, or a naturally narrow ear canal.

Common symptoms: A feeling of fullness in one ear, muffled hearing, and ringing or buzzing that often improves once the wax is cleared.

Risk factors: Regular cotton swab use, hearing aids or earbuds, and older age, since earwax tends to become drier over time.

When to seek evaluation: See a doctor or audiologist for safe removal rather than digging at the ear yourself.

2. Noise-Induced Hearing Damage

What it is: Injury to the tiny hair cells in the inner ear from loud sound exposure.

Why it happens: A single very loud noise, such as a concert, or repeated loud sound over time can damage hair cells, and the brain may generate a ringing signal to fill the gap.

Common symptoms: Ringing or buzzing after a loud event, often paired with muffled hearing or a temporary "underwater" feeling that can become permanent with repeated exposure.

Risk factors: Work in loud environments, frequent concerts, high headphone volume, and skipping hearing protection.

When to seek evaluation: If ringing follows a specific loud noise exposure and does not fade within a day or two, have your hearing checked.

3. Eustachian Tube Dysfunction and Middle Ear Fluid

What it is: A blocked or poorly working Eustachian tube, the passage that equalizes pressure between the middle ear and the back of the nose.

Why it happens: A cold, sinus infection, allergies, or rapid altitude changes can cause the tube to swell shut or trap fluid behind the eardrum.

Common symptoms: A clogged or full feeling in one ear, muffled hearing, popping or crackling sounds, and ringing that eases once the congestion clears.

Risk factors: A recent respiratory infection, seasonal allergies, and frequent air travel or scuba diving.

When to seek evaluation: If fullness and ringing last more than a couple of weeks after a cold clears, or come with ear pain or drainage, get it checked.

4. TMJ (Jaw Joint) Disorder

What it is: A problem with the temporomandibular joint, which sits just in front of the ear.

Why it happens: Jaw clenching, teeth grinding, or joint inflammation can irritate nerves and structures that share pathways with the ear.

Common symptoms: Ringing in one ear with jaw pain, clicking or popping when chewing, or aching near the temple and ear.

Risk factors: Teeth grinding, especially at night, stress, and jaw injury or arthritis.

When to seek evaluation: A dentist or doctor can assess jaw function if ringing consistently comes with jaw pain or clicking.

5. Medication Side Effects (Ototoxicity)

What it is: Ringing caused by a medication that affects the inner ear.

Why it happens: Certain drugs, including high-dose aspirin, some antibiotics, certain diuretics, and some chemotherapy medications, can affect the inner ear as a side effect.

Common symptoms: New ringing that starts after beginning a medication or raising its dose, sometimes with changes in hearing.

Risk factors: High-dose aspirin or NSAID use, certain intravenous antibiotics, and specific chemotherapy drugs.

When to seek evaluation: Tell your prescribing doctor about any new ringing. Do not stop a prescribed medication on your own without medical advice.

6. Meniere's Disease

What it is: An inner ear disorder involving abnormal fluid pressure that affects hearing and balance.

Why it happens: The exact cause is not fully understood, but it involves excess fluid buildup in the inner ear.

Common symptoms: Episodes of ringing in one ear with vertigo (spinning dizziness), ear fullness, and hearing loss that comes and goes and can worsen over time.

Risk factors: A family history of Meniere's disease and, in some people, allergies or autoimmune conditions.

When to seek evaluation: See a doctor if ringing comes with recurring vertigo spells, since early treatment can help protect hearing.

7. Acoustic Neuroma (Vestibular Schwannoma)

What it is: A rare, usually slow-growing, noncancerous growth on the nerve connecting the ear to the brain.

Why it happens: It develops from cells around the vestibular nerve; most cases have no known cause.

Common symptoms: Gradual, one-sided ringing, often with slowly worsening hearing loss on that side and sometimes unsteadiness.

Risk factors: It is rare overall; a genetic condition called neurofibromatosis type 2 raises the risk.

When to seek evaluation: One-sided ringing or hearing loss that persists and slowly worsens should be evaluated with a hearing test and, if needed, imaging.

8. Sudden Sensorineural Hearing Loss

What it is: A rapid, unexplained loss of hearing in one ear, sometimes with new ringing, developing over hours to a few days.

Why it happens: The cause is often unclear, but it may involve a viral infection, reduced blood flow, or an inner ear immune reaction.

Common symptoms: A sudden drop in hearing, often first noticed as new ringing or a plugged feeling, sometimes with dizziness.

Risk factors: Can occur at any age; cardiovascular risk factors may play a role.

When to seek evaluation: This is a medical emergency. Treatment, often with steroids, works best when started within days, so seek same-day medical or ENT care if you notice sudden hearing loss.

When to Seek Medical Care