Constant ringing in your ears, known as tinnitus, is almost always tied to some degree of hearing damage. Roughly 90% of people with tinnitus have measurable hearing loss, even if they haven’t noticed it yet. The ringing itself isn’t coming from your ear, though. It’s generated by your brain in response to changes in the signals it receives from your inner ear.
Why Your Brain Creates a Sound That Isn’t There
Your inner ear contains thousands of tiny hair cells that convert sound vibrations into electrical signals for the brain. When those hair cells are damaged, whether from loud noise, aging, infection, or something else, they start sending abnormal electrical signals. Your brain misinterprets these signals as sound, producing the phantom ringing, buzzing, or hissing you hear.
Over time, the damage triggers a chain reaction deeper in the brain. Areas along the auditory pathway become hyperactive, firing even when no real sound is present. The brain’s internal “sound map” reorganizes itself, and the normal balance between excitatory and inhibitory nerve signals gets disrupted. This is why tinnitus often persists even after the original cause is treated: the brain has essentially rewired itself to keep producing the phantom sound.
Noise Exposure and Age-Related Hearing Loss
These are the two most common causes by a wide margin. Prolonged exposure to loud environments (concerts, construction sites, headphones at high volume) damages inner ear hair cells permanently. The damage accumulates over years, so you may not connect the noise exposure to the ringing that shows up later. A single extremely loud event, like an explosion or gunshot, can also trigger immediate, lasting tinnitus.
Age-related hearing loss follows a similar pattern. Hair cells gradually deteriorate starting in your 40s and 50s, typically affecting high-frequency sounds first. The ringing often matches the frequency range where your hearing has declined most, which is why many people describe it as a high-pitched tone.
Earwax Buildup
This is one of the most fixable causes. When earwax becomes impacted, it blocks the ear canal and changes how sound reaches your eardrum. That blockage can produce ringing, muffled hearing, ear pain, or itchiness. The good news: symptoms typically resolve once the wax is removed, which usually takes just a few minutes in a doctor’s office. If your ringing started gradually alongside a feeling of fullness in one ear, impacted earwax is worth ruling out before assuming something more serious.
Medications That Affect Your Ears
Certain drugs are known to be “ototoxic,” meaning they can damage hearing or trigger tinnitus as a side effect. The most common culprits include high-dose aspirin, certain antibiotics (particularly when prescribed at high doses for extended periods), loop diuretics used for heart failure and kidney disease, and some chemotherapy drugs. In many cases, the tinnitus fades after the medication is stopped or the dose is lowered, but some drugs can cause permanent changes.
If your ringing started shortly after beginning a new medication or changing a dose, that timing is worth mentioning to your doctor.
Jaw Problems and Neck Tension
Your jaw joint sits remarkably close to the structures of your inner ear. The two share muscles, ligaments, and nerve pathways. When the jaw joint is irritated or misaligned (a condition called TMD, or temporomandibular disorder), that dysfunction can alter how your brain processes sound, producing tinnitus. This type is sometimes called “somatic tinnitus” because it originates from a physical structure outside the ear itself.
A clue that your jaw may be involved: the ringing changes in pitch or volume when you clench your teeth, open your mouth wide, or turn your head. Neck injuries and chronic muscle tension in the head and neck region can produce similar effects through the same shared nerve connections.
Pulsatile Tinnitus: When the Sound Matches Your Heartbeat
If the sound you hear is rhythmic and pulses in sync with your heartbeat, that’s a distinct condition called pulsatile tinnitus. Unlike the more common steady ringing, pulsatile tinnitus usually has a detectable vascular cause. You’re hearing turbulent blood flow near your ear.
Conditions that can cause it include high blood pressure putting extra force on blood vessel walls, atherosclerosis (plaque buildup) creating uneven blood flow through arteries near the ear, abnormal tangles of blood vessels near the ear, head injuries affecting nearby veins or arteries, and increased pressure from cerebrospinal fluid buildup around the brain. Because pulsatile tinnitus points to a specific underlying problem, it’s more likely to be treatable. Managing the underlying condition, such as controlling blood pressure, often reduces or eliminates the sound.
Ménière’s Disease
Ménière’s disease causes episodes of ringing along with a distinctive combination of other symptoms: vertigo lasting anywhere from 20 minutes to 12 hours, hearing loss concentrated in low to medium frequencies, and a feeling of fullness or pressure in the affected ear. These symptoms come and go unpredictably, often affecting just one ear. If your ringing is accompanied by spinning dizziness and fluctuating hearing, this pattern is characteristic of Ménière’s.
Thyroid and Metabolic Conditions
Thyroid hormones play a direct role in maintaining the health of the nerves in your ears and regulating proteins that support inner ear structure. An underactive thyroid can disrupt these processes enough to cause tinnitus. Diabetes and insulin resistance also affect blood flow to the tiny vessels that supply the inner ear, potentially starving hair cells of oxygen and nutrients. If your tinnitus appeared alongside other symptoms of thyroid dysfunction (fatigue, weight changes, sensitivity to cold) or poorly controlled blood sugar, the metabolic condition may be a contributing factor.
Warning Signs That Need Prompt Evaluation
Most tinnitus is benign, but certain patterns warrant faster investigation. Ringing in only one ear, especially when accompanied by hearing loss on that same side, can signal an acoustic neuroma, a slow-growing, noncancerous tumor on the nerve connecting the ear to the brain. Hearing loss from an acoustic neuroma typically develops gradually over months to years, though in rare cases it can be sudden. Other signs include balance problems, dizziness, and facial numbness. Diagnosis requires a brain MRI.
Pulsatile tinnitus also deserves prompt attention, since it can reflect vascular conditions that benefit from treatment. And any sudden onset of ringing paired with sudden hearing loss should be treated as time-sensitive, since early intervention improves the chances of recovering hearing.