If you hear ringing, buzzing, humming, or any other sound in your ears that isn’t coming from an outside source, you likely have tinnitus. About 10% of U.S. adults, roughly 25 million people, have experienced it in the past year. The sounds can be constant or come and go, affect one ear or both, and range from barely noticeable to severely disruptive.
What Tinnitus Sounds Like
Tinnitus isn’t limited to ringing. The phantom sound can take many forms: buzzing, roaring, whistling, humming, clicking, hissing, or squealing. Some people hear a single steady tone, while others hear a combination that shifts over time. The pitch can be low like a hum or high like a whine. Volume varies too. For some people it’s a faint background noise they only notice in quiet rooms. For others it’s loud enough to interfere with conversation and sleep.
The key feature that distinguishes tinnitus from normal hearing is that the sound has no external source. If you cover your ears and the sound stays the same or gets louder, that’s a strong signal it’s originating inside your auditory system rather than from your environment.
Why Your Brain Creates Phantom Sound
Most tinnitus starts in the inner ear. Tiny sensory cells in your cochlea (the spiral-shaped structure deep inside the ear) amplify sound vibrations and convert them into electrical signals for your brain. When some of these cells are damaged or lost, they send weaker or irregular signals. Your brain compensates by turning up its own internal volume, essentially becoming more sensitive to fill in the gap. That neural overcompensation produces the phantom sound you perceive as tinnitus.
This is why tinnitus and hearing loss so often go together. But here’s what surprises many people: you can develop tinnitus even when your hearing tests come back normal. Minor damage to outer hair cells in the cochlea can disrupt signal processing without being severe enough to show up on a standard hearing exam. Your brain still detects the mismatch and reacts.
Constant vs. Intermittent Sounds
Tinnitus can be present all the time or appear only in certain situations. Intermittent tinnitus often shows up after loud noise exposure (a concert, power tools, headphones at high volume) and fades within hours or days. If it keeps returning or becomes constant, that typically indicates ongoing changes in your auditory system rather than a one-time event.
Globally, about 10% of adults with tinnitus experience it as chronic, meaning it lasts longer than three months. Roughly 2% experience it as severe. If yours has persisted for weeks and isn’t fading, it’s worth getting a hearing evaluation.
Pulsatile Tinnitus Feels Different
One specific type deserves its own mention. Pulsatile tinnitus produces a rhythmic whooshing or thumping that keeps pace with your heartbeat. If you check your pulse while hearing the sound and they match up, that’s pulsatile tinnitus. You’re essentially hearing blood flowing through vessels near your ears.
This form is rare, but it’s medically significant because it often points to an identifiable vascular cause: high blood pressure, anemia, atherosclerosis (narrowed arteries), hyperthyroidism, or abnormal blood vessel formations near the ear. Unlike standard tinnitus, pulsatile tinnitus frequently has a treatable underlying condition. A doctor can sometimes even hear the sound during an exam using a stethoscope.
Common Causes and Triggers
Noise exposure is the most common trigger. Repeated exposure to loud environments, or even a single very loud event, damages the sensory cells in your inner ear. Age-related hearing loss is the second most common cause, with tinnitus becoming more prevalent after 50.
Certain medications can also cause or worsen tinnitus. Aspirin at high doses, quinine (used for malaria), and loop diuretics (prescribed for heart and kidney conditions) are known to cause temporary tinnitus that resolves when you stop taking them. More concerning are medications that can cause permanent damage, including certain aminoglycoside antibiotics like gentamicin and chemotherapy drugs like cisplatin. If tinnitus appeared after starting a new medication, that connection is worth raising with your prescriber.
Other triggers include earwax buildup, jaw joint problems, head or neck injuries, and blood vessel disorders. Stress and fatigue don’t cause tinnitus directly, but they can make existing tinnitus louder or harder to ignore.
How Tinnitus Is Diagnosed
There’s no blood test or brain scan that detects tinnitus directly. Diagnosis starts with a hearing exam. You’ll sit in a soundproof room wearing earphones while specific tones are played into one ear at a time. You signal when you hear each sound, and the results are compared against norms for your age. This identifies any hearing loss that could be driving your tinnitus.
Your audiologist may also ask you to describe the pitch and volume of your tinnitus and try to match it using external tones. This “pitch matching” helps characterize what you’re experiencing. If pulsatile tinnitus is suspected, imaging of the blood vessels in your head and neck may be ordered to look for vascular causes.
More than 99% of tinnitus cases are subjective, meaning only you can hear the sound. In less than 1% of cases, the sound is loud enough that a clinician can detect it during an exam. This objective tinnitus is usually caused by blood flow or muscle contractions near the ear.
Measuring How Much It Affects You
If you’re unsure whether your tinnitus is “bad enough” to seek help, a widely used screening tool called the Tinnitus Handicap Inventory can help you gauge its impact. It’s a 25-question survey that scores from 0 to 100. A score of 0 to 16 means slight or no impact. Scores of 18 to 36 indicate mild effects. Moderate falls between 38 and 56, severe between 58 and 76, and anything above 78 is considered catastrophic. Many audiology clinics use this questionnaire as a starting point, and versions are available online.
Signs That Need Prompt Attention
Most tinnitus is annoying but not dangerous. Certain patterns, however, signal something more serious. Tinnitus in only one ear is a red flag. Unilateral tinnitus is a common presenting sign of both acoustic neuroma (a noncancerous growth on the hearing nerve) and Ménière’s disease.
Sudden hearing loss paired with new tinnitus is considered an ear emergency. Same-day evaluation is recommended because early treatment improves outcomes significantly. Tinnitus accompanied by dizziness or vertigo, facial weakness, persistent ear pain, or ear discharge also warrants urgent evaluation. And sudden-onset pulsatile tinnitus can indicate a serious condition affecting blood vessels in the brain, so it shouldn’t be dismissed as just another ear noise.
If your tinnitus appeared gradually, affects both ears roughly equally, and isn’t accompanied by hearing loss, dizziness, or pain, it’s less likely to indicate a dangerous underlying condition. But if it’s affecting your concentration, mood, or sleep, that alone is reason enough to get it evaluated.