Ringing in both ears, known as bilateral tinnitus, is most commonly caused by some degree of hearing loss. That hearing loss can come from aging, prolonged noise exposure, certain medications, or cardiovascular problems. Unlike ringing in just one ear, which sometimes points to a localized issue like an ear infection or a tumor on the auditory nerve, ringing in both ears typically signals something systemic affecting the entire auditory system.
How the Brain Creates Phantom Sound
Understanding why both ears ring at once starts with what’s happening inside the inner ear. Your cochlea, the spiral-shaped organ deep in each ear, is lined with thousands of tiny hair cells. These cells convert sound vibrations into electrical signals your brain interprets as sound. When those hair cells are damaged, whether from loud noise, aging, or a toxic medication, they stop sending signals at certain frequencies.
Your brain doesn’t simply accept the silence. When it notices reduced input from the damaged hair cells, it compensates by turning up its own internal volume. Neurons in the auditory processing centers increase their spontaneous firing rates, essentially generating electrical activity on their own in the absence of any real sound. Your brain interprets this self-generated activity as sound, and the result is tinnitus. Because the underlying cause (hearing loss, medication, blood flow changes) usually affects both ears equally, the phantom sound shows up on both sides.
Over time, the brain can also reorganize the way it maps different sound frequencies. Neurons that once responded to the lost frequencies start responding to neighboring ones instead, and groups of neurons begin firing in sync. This abnormal synchronization reinforces the phantom signal, which is one reason tinnitus can persist long after the initial damage occurs.
Age-Related Hearing Loss
The single most common driver of bilateral tinnitus is age-related hearing loss, called presbycusis. It typically begins in your 50s or 60s and affects both ears symmetrically. The hair cells in the high-frequency region of the cochlea deteriorate first, which is why age-related tinnitus often presents as a high-pitched ringing or whine. Because the loss is gradual, many people notice the tinnitus before they realize their hearing has changed at all.
Noise Exposure
Loud sound is the other major cause, and it doesn’t require decades of exposure. A single extremely loud event, like a gunshot or explosion at close range, can damage hair cells permanently. More often, though, it’s cumulative: years of working around heavy equipment, playing in a band, or listening to music at high volumes through earbuds.
NIOSH recommends keeping noise exposure below 85 decibels over an eight-hour day to protect hearing. For context, a busy restaurant sits around 80 to 85 decibels, a chainsaw around 110. Every 3-decibel increase doubles the sound energy hitting your ears and cuts the safe exposure time in half. At 100 decibels, roughly the volume of a loud concert, NIOSH recommends no more than 15 minutes of unprotected exposure per day. Factory and construction workers, musicians, and military personnel face the highest risk, but anyone regularly using earbuds at high volume is vulnerable too.
Medications That Damage Hearing
Certain drugs are directly toxic to the hair cells in the inner ear, and because they circulate through the bloodstream, they affect both ears simultaneously. The most well-known categories include:
- High-dose aspirin and anti-inflammatory painkillers. Aspirin-related tinnitus is usually reversible once the dose is reduced, but it’s one of the most frequently reported drug-related causes.
- Loop diuretics. These are prescribed for heart failure and severe fluid retention. The risk is highest with rapid intravenous dosing or in people with kidney problems.
- Aminoglycoside antibiotics. A class of antibiotics used for serious infections. They can cause permanent hearing damage, particularly at high doses or with prolonged courses.
- Platinum-based chemotherapy drugs. Hearing loss and tinnitus are well-documented side effects, sometimes irreversible, in patients receiving these treatments for cancer.
- Certain antimalarial drugs. Chloroquine and related compounds carry a known risk of hearing damage with long-term use.
If tinnitus appears shortly after starting a new medication, that timing is worth flagging. In some cases, the ringing resolves when the drug is stopped or the dose is adjusted. In others, particularly with aminoglycoside antibiotics and chemotherapy agents, the damage may be permanent.
High Blood Pressure and Cardiovascular Issues
Your inner ear depends on a rich blood supply delivered through very small arteries. High blood pressure can compromise that supply in a few ways: it increases blood viscosity, reducing oxygen delivery to the delicate cochlear structures, and in severe cases it can cause small hemorrhages within the cochlea itself.
Research from a study of hypertensive adults found that 41.5% of those with high blood pressure reported tinnitus, compared to 22.8% of people with normal blood pressure. The association was strongest in people with severe (grade 3) hypertension, who were nearly four times more likely to experience tinnitus. Notably, about 30% of the hypertensive group had tinnitus even without measurable hearing loss, suggesting that vascular changes alone can trigger the symptom before any permanent auditory damage shows up on a hearing test.
Atherosclerosis, the buildup of plaque in artery walls, can further reduce blood flow to the inner ear. Diabetes, high cholesterol, and smoking all compound the risk by accelerating damage to small blood vessels throughout the body, including those feeding the cochlea.
Jaw Problems and Muscle Tension
Temporomandibular joint (TMJ) disorders are an underappreciated cause of bilateral tinnitus. The jaw joint sits immediately in front of each ear canal, and a ligament from the jaw connects directly to one of the tiny bones in the middle ear. When the jaw joint is inflamed, misaligned, or chronically tense, that mechanical connection can transmit abnormal signals to the hearing system. Clenching, grinding your teeth at night, or chronic jaw tension from stress can all contribute. People with TMJ-related tinnitus often notice the ringing fluctuates with jaw movement or worsens during periods of stress.
Stress, Sleep, and Tinnitus Perception
Stress doesn’t directly damage the ear, but it powerfully amplifies how you perceive tinnitus. When your nervous system is in a heightened state, your brain prioritizes threat detection, and a phantom sound it might otherwise filter out becomes impossible to ignore. Sleep deprivation works through a similar mechanism. People often describe a cycle where tinnitus disrupts sleep, poor sleep increases stress, and increased stress makes the tinnitus louder.
Diet and Tinnitus
The relationship between diet and tinnitus is weaker than many people assume. One clear exception is sodium: for people with Ménière’s disease, a condition involving fluid imbalance in the inner ear, high salt intake can worsen both hearing fluctuations and tinnitus. The American Tinnitus Association notes a strong correlation between salt consumption and Ménière’s symptoms specifically.
Caffeine, on the other hand, has very little scientific evidence linking it to tinnitus. Some people report that coffee worsens their symptoms, but controlled studies haven’t confirmed a consistent effect. If you notice a pattern with caffeine, reducing it is a reasonable experiment, but there’s no medical reason to cut it preemptively. Alcohol follows a similar pattern: some individuals notice a temporary spike in ringing after drinking, but the evidence for a direct biological mechanism is thin.
When Ringing Points to Something Else
Most bilateral tinnitus traces back to the common causes above, but a few less typical scenarios are worth knowing. Anemia and thyroid disorders can both produce tinnitus by changing blood flow dynamics or metabolic function in the auditory system. Earwax impaction, while simple, can cause ringing in both ears if both canals are blocked. And in rare cases, bilateral tinnitus accompanies conditions like intracranial hypertension, where increased pressure around the brain affects auditory processing. Pulsatile tinnitus, a rhythmic whooshing that matches your heartbeat, is a distinct variant that warrants prompt evaluation because it sometimes reflects a vascular abnormality.
For the majority of people, ringing in both ears reflects cumulative wear on the auditory system from noise, aging, medications, or cardiovascular strain. Identifying which factors apply to you is the first step toward managing it effectively.