Tinnitus, the perception of ringing, buzzing, or hissing in your ears without an external sound source, affects roughly 10% to 14% of adults depending on age group. It isn’t a disease itself but a symptom with a wide range of possible causes, from noise damage and medication side effects to jaw problems and blood vessel conditions. Understanding what’s behind it helps you figure out whether yours is likely to improve, stay stable, or needs medical attention.
How the Inner Ear Triggers Phantom Sound
Most tinnitus starts with a disruption in the inner ear. Your cochlea contains tiny outer hair cells that amplify sound vibrations and inner hair cells that convert those vibrations into electrical signals for the brain. When the outer hair cells are damaged, even slightly, they send weaker or poorly timed signals to the inner hair cells. This mismatch between what the ear sends and what the brain expects is where tinnitus begins.
What happens next is a chain reaction in the brain. When the auditory nerve delivers reduced input, a structure called the dorsal cochlear nucleus compensates by turning up its own activity. Neurons there begin firing more frequently and more synchronously than normal. This hyperactivity, essentially the brain amplifying a signal that isn’t there, gets relayed up through higher auditory centers and into the cortex. The brain interprets this self-generated neural noise as sound. Critically, this means tinnitus often lives in the brain as much as in the ear, which is why it can persist even after the original ear damage stabilizes.
The outer hair cell damage behind this process doesn’t always show up on a standard hearing test. Minor losses that fall within “normal” hearing thresholds can still create enough of a signal disruption to produce tinnitus. This explains why many people with tinnitus are told their hearing is fine.
Noise Exposure: The Most Common Cause
Loud sound is the single biggest driver of tinnitus. Repeated exposure to sounds at or above 85 decibels, roughly the level of heavy city traffic or a lawnmower, can damage those outer hair cells over months or years. At 120 decibels (an ambulance siren), safe exposure drops to about 9 seconds. Sounds at 140 decibels or higher, like firearms or firecrackers, can cause immediate damage from a single exposure.
Noise-induced tinnitus often starts as a temporary ringing after a concert or a loud workday. If the exposure is repeated, the damage accumulates and the ringing becomes permanent. Musicians, construction workers, military personnel, and anyone who regularly uses earbuds at high volume are at elevated risk. The damage is cumulative and irreversible, since human hair cells do not regenerate.
Medications That Affect the Ear
Certain drugs can cause or worsen tinnitus by directly affecting the inner ear or auditory nerve. The risk typically increases with higher doses and longer treatment courses. Drug classes most likely to cause problems include:
- High-dose aspirin and related pain relievers: one of the oldest known triggers, usually reversible when the dose is lowered
- Loop diuretics used for heart failure and kidney disease
- Macrolide antibiotics like azithromycin and clarithromycin, particularly at high doses over extended periods
- Platinum-based chemotherapy drugs, which carry a high risk of permanent hearing changes
- Some biologic therapies used in immunotherapy and disease-modifying treatment
If tinnitus appears after starting a new medication, that timing is worth noting. In many cases, the tinnitus fades after the drug is stopped or the dose adjusted, though chemotherapy-related changes tend to be more lasting.
Jaw and Neck Problems
The jaw joint sits immediately next to the cochlea, and nerve pathways physically connect the two regions. When you have a jaw disorder (often called TMJ dysfunction), inflammation or displacement of the joint capsule can compress the auriculotemporal nerve, which runs alongside the ear. Pain signals from the jaw and neck travel through the trigeminal nerve into the dorsal cochlear nucleus, the same brainstem structure involved in noise-induced tinnitus. There, somatic signals from the jaw merge with auditory signals in shared neurons called fusiform cells.
This overlap means jaw clenching, teeth grinding, whiplash, or chronic neck tension can all generate or amplify tinnitus. A telling sign of this type is that the sound changes when you move your jaw, press on your face, or turn your neck. Treating the underlying jaw or cervical spine issue often reduces the tinnitus in these cases.
Pulsatile Tinnitus: A Rhythmic Type With Different Causes
If your tinnitus beats in time with your heartbeat, you likely have pulsatile tinnitus, which has a distinct set of causes. Unlike the more common steady ringing, pulsatile tinnitus usually results from actual sound created by blood flow near the ear.
Atherosclerosis (plaque buildup) in the carotid artery can create turbulent blood flow through narrowed segments of the vessel, producing a whooshing sound the ear picks up. High blood pressure, aneurysms, and a condition called fibromuscular dysplasia, where artery walls develop abnormally, can do the same. On the venous side, turbulent flow through the internal jugular vein or an anatomical variant called a high-riding jugular bulb can produce similar rhythmic sounds.
In rarer cases, a vascular tumor called a glomus tympanicum grows behind the eardrum. It sometimes appears as a reddish, pulsating mass visible during an ear exam. Pulsatile tinnitus generally warrants more thorough evaluation than the steady kind because its causes are often identifiable and treatable.
Hearing Loss and Aging
Age-related hearing loss is one of the most common tinnitus triggers. As you age, the hair cells in the cochlea gradually deteriorate, reducing auditory input to the brain and setting off the same compensatory hyperactivity described earlier. Tinnitus prevalence rises steeply with age: about 10% of young adults report it, compared to 14% of middle-aged adults and 24% of older adults. The condition affects men and women at similar rates.
Any form of hearing loss, whether from aging, chronic ear infections, a perforated eardrum, or a buildup of earwax blocking the ear canal, can produce tinnitus through the same basic mechanism of reduced input.
Ménière’s Disease
Ménière’s disease is an inner ear condition defined by a specific combination of symptoms: recurring episodes of vertigo lasting 20 minutes to 24 hours, documented hearing loss, and tinnitus or a feeling of fullness in the ear. The tinnitus in Ménière’s often fluctuates, worsening before or during vertigo attacks, and typically affects one ear.
The underlying problem involves abnormal fluid pressure in the inner ear. Dietary sodium has long been thought to influence this fluid balance, and caffeine and alcohol may reduce blood supply to the inner ear through blood vessel constriction. However, a Cochrane review found no randomized controlled trials that actually support or refute restricting salt, caffeine, or alcohol for Ménière’s symptoms. Despite this, many clinicians still recommend these dietary changes based on clinical experience.
When Tinnitus Needs Evaluation
Most tinnitus is bilateral, steady, and tied to some degree of noise exposure or hearing change. This type, called primary tinnitus, is the most common and generally not dangerous, though it can significantly affect quality of life. Clinical guidelines recommend a comprehensive hearing test if your tinnitus is persistent (six months or longer), occurs in only one ear, or comes with noticeable hearing difficulty.
Certain patterns call for closer attention. Tinnitus that is pulsatile, limited to one ear, or accompanied by sudden hearing loss, dizziness, or neurological symptoms like facial weakness may point to an underlying condition that needs specific treatment. Imaging of the head and neck is not recommended for typical, nonpulsatile tinnitus affecting both ears, but becomes more appropriate when those red-flag features are present.