Tinnitus, the perception of ringing, buzzing, or hissing sounds without an external source, affects about 14.4% of adults worldwide. Almost 10% experience chronic tinnitus lasting more than three months. It’s rarely a condition on its own. Instead, it’s typically a symptom of something else happening in your body, from hearing damage and jaw problems to blood vessel disorders and metabolic disease.
Hearing Loss and Cochlear Damage
The single most common driver of tinnitus is damage to the tiny hair cells inside the cochlea, the spiral-shaped structure in your inner ear that converts sound waves into nerve signals. When those hair cells are destroyed by aging, loud noise exposure, or toxic substances, they don’t grow back. The loss creates a gap in the range of frequencies your brain expects to receive.
What happens next is a chain reaction in your auditory system. Neurons in several brain structures that process sound begin firing spontaneously at higher rates than normal, essentially filling in the missing signal with phantom sound. This hyperactivity has been documented in the brainstem, midbrain, and auditory cortex. Critically, it persists even after the damaged part of the inner ear is completely disconnected, meaning the brain itself sustains the tinnitus once it starts. The phantom sound typically matches the frequency range where hearing loss is greatest, which is why age-related hearing loss (usually affecting high-pitched sounds first) often produces a high-pitched ringing.
Noise-induced hearing loss follows the same pattern. A single loud blast or years of occupational noise exposure can destroy enough hair cells to trigger the same runaway neural activity. Outer hair cell damage may be an early predisposing factor, though the relationship isn’t perfectly consistent across studies.
Ménière’s Disease
Ménière’s disease is an inner ear disorder that causes a distinctive combination of symptoms: severe vertigo episodes lasting 20 minutes to 12 hours, fluctuating hearing loss (particularly in lower frequencies), tinnitus, and a feeling of fullness or pressure in the affected ear. These symptoms come and go unpredictably. Some people have isolated attacks separated by months, while others experience clusters over several days.
The tinnitus in Ménière’s disease often worsens just before or during a vertigo attack, sometimes serving as a warning sign. A formal diagnosis requires at least two spontaneous vertigo episodes plus documented hearing loss on a hearing test. The condition typically affects one ear, though it can eventually involve both.
Jaw and Neck Problems
Temporomandibular joint (TMJ) disorders and cervical spine dysfunction can both produce or worsen tinnitus through a mechanism called somatic tinnitus. The key lies in a brainstem structure called the dorsal cochlear nucleus, which acts as a hub where sensory information from your jaw, upper neck, and auditory system all converge. When the TMJ or cervical spine sends abnormal signals (from inflammation, misalignment, or muscle tension), those signals can increase the spontaneous firing rate of auditory neurons, creating or amplifying phantom sound.
There are also more direct mechanical pathways. The jaw joint sits so close to the middle ear that a displaced jaw condyle can physically press on structures connected to the eardrum. The trigeminal nerve, which controls your chewing muscles, also innervates the tensor tympani muscle inside your ear. When the chewing muscles are chronically tense, that tension can spread to the ear muscle and alter how the eardrum vibrates. A hallmark of somatic tinnitus is that it changes in pitch or volume when you clench your jaw, turn your head, or press on certain points around your face and neck.
Medications That Damage the Ear
Certain medications are directly toxic to the inner ear, a property called ototoxicity. The most well-known culprits fall into a few categories:
- Aminoglycoside antibiotics (used for serious bacterial infections) are among the most commonly recognized ototoxic drugs
- Loop diuretics (water pills prescribed for heart failure or kidney disease) can cause tinnitus, sometimes reversibly
- Chemotherapy drugs, particularly platinum-based agents
- Aspirin and related salicylates, especially at high doses
- Quinine, used to treat malaria
Aspirin-induced tinnitus is usually dose-dependent and reversible once the medication is reduced or stopped. Aminoglycoside damage, on the other hand, can be permanent. If you develop ringing in your ears while taking any medication, that’s worth reporting promptly so the dosage or drug can be reconsidered before lasting damage occurs.
Blood Vessel and Cardiovascular Conditions
Pulsatile tinnitus is a distinct subtype where the sound you hear pulses in rhythm with your heartbeat, like a whooshing or thumping. Unlike the more common “ringing” type, pulsatile tinnitus usually has a detectable physical source: turbulent blood flow near the ear.
Atherosclerosis of the carotid artery is one cause. When plaque narrows the vessel, blood forces through the stenotic segment with enough turbulence to produce audible sound. Risk factors include high blood pressure, high cholesterol, diabetes, smoking, and peripheral vascular disease. Dissecting aneurysms and fibromuscular dysplasia of the carotid artery are rarer arterial causes.
On the venous side, the most common cause is benign intracranial hypertension (sometimes called pseudotumor cerebri), a condition where pressure inside the skull rises without any tumor or other obvious neurological cause. Turbulent flow through the internal jugular vein can also produce a venous hum heard as pulsatile tinnitus. Because pulsatile tinnitus can signal serious vascular problems, it warrants medical investigation more urgently than the standard ringing type.
Acoustic Neuroma
An acoustic neuroma (vestibular schwannoma) is a benign, slow-growing tumor on the nerve connecting the inner ear to the brain. It’s a particularly important cause to be aware of because tinnitus in only one ear can be an early sign. In a study of nearly 1,000 patients, 51% had tinnitus, with 81% of those describing it as intermittent. The most common presenting symptom was one-sided hearing loss (80% of patients), typically worsening gradually over months or years.
Other symptoms depend on tumor size. Smaller tumors may cause only hearing changes and tinnitus. As they grow, they can press on nearby structures, leading to balance problems, facial numbness, headaches, and in rare cases facial weakness. About 2% of acoustic neuromas are found incidentally on brain scans done for other reasons. If you have persistent tinnitus in one ear, especially with progressive hearing loss on that side, imaging can rule this out.
Thyroid and Metabolic Disorders
Hypothyroidism is linked to a meaningfully higher risk of developing tinnitus. A large cohort study found that people with hypothyroidism developed tinnitus at a rate of 9.49 per 1,000 person-years compared to 6.03 per 1,000 person-years in people without the condition. After adjusting for age, sex, income, and hearing-related conditions, hypothyroidism still carried a 35% increased risk. This held true across all subgroups regardless of gender, age, or other health conditions.
Diabetes is another metabolic condition associated with tinnitus, likely through its effects on small blood vessels and nerve function in the inner ear. Atherosclerosis, which develops more aggressively in people with diabetes, can reduce blood supply to the cochlea. These metabolic connections highlight why tinnitus sometimes improves when the underlying hormonal or blood sugar disorder is brought under better control.
Earwax and Physical Blockages
Sometimes the cause is far simpler than any of the above. Impacted earwax that fully blocks the ear canal can produce tinnitus along with muffled hearing and a sensation of fullness. The mechanism is straightforward: the blockage changes the pressure dynamics in the canal and disrupts normal sound transmission. Symptoms typically resolve completely once the wax is cleared. Foreign objects lodged in the ear canal can have the same effect. This is one of the most easily treatable causes, which makes it worth ruling out early.