Tinnitus, the perception of ringing, buzzing, or roaring in your ears when no external sound is present, affects roughly 14.4% of adults worldwide. About 10% experience it chronically, meaning it lasts longer than three months. The causes range from noise damage and medication side effects to jaw problems and blood vessel conditions, but the most common trigger is some form of hearing loss that changes how your brain processes sound.
How Hearing Loss Creates Phantom Sound
The most frequent cause of tinnitus is damage to the tiny sensory hair cells inside your inner ear. These cells convert sound vibrations into electrical signals your brain interprets as sound. When they’re damaged or destroyed, they stop sending certain frequencies to the brain. What happens next is the key to understanding tinnitus: your brain doesn’t just go quiet in those missing frequency ranges. Instead, neurons in the brainstem begin firing in abnormal, synchronized patterns, essentially generating signals on their own. Your brain interprets these self-generated signals as sound, even though nothing external is producing it.
This process closely parallels phantom limb pain, where people feel sensations in a limb that’s been amputated. Research published in PNAS found a strong correlation (r = 0.82) between the severity of someone’s tinnitus and the degree to which their auditory cortex had physically reorganized. The brain region responsible for the missing frequency literally shifts position on the brain’s sound-processing map, and the more it shifts, the louder the phantom sound feels. Interestingly, not everyone with identical inner ear damage develops tinnitus. Animal studies show that the distinguishing factor is whether brainstem neurons develop those distinct synchronized firing patterns, not the extent of the damage itself.
Noise Exposure
Loud sound is the single most preventable cause of tinnitus. Sounds at or below 70 decibels, roughly the level of a washing machine, are unlikely to cause damage even with prolonged exposure. But repeated or extended exposure at 85 decibels or above (think heavy traffic, a loud restaurant, or a lawnmower) can damage hair cells and lead to both hearing loss and tinnitus. The louder the sound, the less time it takes: a single gunshot or explosion can cause immediate, permanent damage.
Tinnitus from noise exposure sometimes fades within hours or days, particularly after a one-time event like a loud concert. But when exposure is repeated over months or years, the damage accumulates and the tinnitus often becomes permanent. This is why it’s so common among construction workers, musicians, military veterans, and people who regularly use headphones at high volume.
Medications That Damage the Ear
More than 200 medications list tinnitus as a potential side effect. The drug classes most strongly linked to ear damage include aminoglycoside antibiotics (a group of IV antibiotics used for serious infections), platinum-based chemotherapy drugs, high-dose aspirin and other anti-inflammatory painkillers, quinine (used for malaria), and loop diuretics (a type of water pill prescribed for heart failure or kidney disease).
Drug-related tinnitus typically shows up as a high-pitched ringing in both ears, often alongside some degree of hearing loss. In some cases, particularly with aspirin or diuretics, the tinnitus reverses once you stop the medication. With aminoglycoside antibiotics or chemotherapy agents, the damage can be permanent. If you notice new ear ringing after starting a medication, that’s worth bringing up with whoever prescribed it.
Jaw and Neck Problems
Your jaw joint sits remarkably close to your ear canal, and this proximity creates a direct pathway for jaw dysfunction to produce tinnitus. Disorders of the temporomandibular joint (TMJ) can trigger or worsen ear ringing through several mechanisms. The muscles that control jaw movement and the muscles that tension your eardrum share the same nerve supply, meaning deep pain or spasm in one set can activate the other. Nerve fibers from the jaw and upper neck also feed directly into the brain’s auditory processing centers, so dysfunction in these areas can literally inject false signals into your hearing system.
There’s also a structural connection: a small ligament runs from the jaw’s disc directly to one of the tiny bones in your middle ear. When the jaw joint is misaligned or inflamed, mechanical force can transmit through this ligament and disturb middle ear function. Tinnitus linked to jaw problems has a distinctive feature. You can often change its volume or pitch by clenching your jaw, opening your mouth wide, or turning your neck. This type is called somatic tinnitus, and it sometimes improves with treatment of the underlying jaw or neck issue.
Pulsatile Tinnitus: When You Hear Your Heartbeat
Pulsatile tinnitus is a distinct category. Instead of a constant tone, you hear a rhythmic whooshing or thumping that matches your pulse. Unlike other forms of tinnitus, pulsatile tinnitus usually has a physical, identifiable source: turbulent blood flow near the ear. Conditions that cause it include high blood pressure, which puts extra force on vessel walls near the ear; atherosclerosis, where cholesterol buildup creates uneven blood flow that generates audible turbulence; anemia, which increases overall blood flow volume; and abnormal tangles of blood vessels near the ear called arteriovenous malformations.
Less common causes include increased pressure of cerebrospinal fluid around the brain (idiopathic intracranial hypertension), abnormalities in the sinus wall of the skull, and Paget’s disease, a bone condition that increases blood flow through the skull. Pulsatile tinnitus is more likely than other types to have a treatable underlying cause, so it warrants thorough investigation.
Ménière’s Disease
Ménière’s disease is an inner ear disorder that produces a characteristic combination of symptoms: episodes of vertigo (intense spinning), fluctuating hearing loss, tinnitus, and a feeling of fullness or pressure in the affected ear. The tinnitus in Ménière’s disease tends to be low-pitched, often described as roaring, and it frequently worsens during or just before a vertigo attack. Early on, hearing loss and tinnitus may come and go, but over time the hearing loss can become permanent.
Thyroid and Metabolic Conditions
Thyroid function has a measurable relationship with tinnitus. A study using national health survey data found that each one-unit increase in free T4 (the active thyroid hormone) was associated with 67% lower odds of tinnitus. About 15% of people with hypothyroidism, a condition where the thyroid gland produces too little hormone, also experience tinnitus symptoms. The exact mechanism isn’t fully understood, but thyroid hormones appear to affect inner ear function and auditory nerve signaling through both direct and indirect pathways.
Hyperthyroidism can also contribute, though through a different route. An overactive thyroid speeds up heart rate and increases blood flow, which can create the conditions for pulsatile tinnitus. Other metabolic conditions linked to tinnitus include diabetes (which can damage the small blood vessels supplying the inner ear) and iron-deficiency anemia.
Other Common Triggers
Beyond these major categories, several other factors commonly cause or worsen tinnitus:
- Earwax buildup can block the ear canal and change pressure on the eardrum, producing or amplifying tinnitus. This is one of the most easily fixable causes.
- Ear infections or sinus infections can cause temporary tinnitus that resolves once the infection clears.
- Age-related hearing loss (presbycusis) is a major driver of tinnitus in people over 60, as the gradual loss of hair cells triggers the same brain reorganization seen with noise damage.
- Head and neck injuries can damage the inner ear structures, auditory nerve, or blood vessels near the ear, leading to tinnitus on the injured side.
- Stress and sleep deprivation don’t cause tinnitus directly, but they amplify the brain’s attention to it, making existing tinnitus feel significantly louder and more intrusive.
Why It Persists
One of the most frustrating aspects of tinnitus is its tendency to become self-sustaining. Even when the original trigger is resolved, say an ear infection clears up or noise exposure stops, the brain changes that produce the phantom sound may already be locked in. The auditory cortex physically reorganizes its frequency map, and emotional processing areas of the brain begin treating the tinnitus signal as important, which keeps it in your conscious awareness. This is why two people with identical hearing test results can have completely different tinnitus experiences: one barely notices it, while the other finds it debilitating. The difference often lies in how deeply the brain’s attention and emotional networks have latched onto the signal, not in the ear itself.