Ear ringing, or tinnitus, is not one of the classic warning signs of a stroke, and the overwhelming majority of people who experience it have nothing to do with stroke. But in a small and important subset of cases, new-onset tinnitus can be among the earliest symptoms of a stroke affecting the back of the brain, sometimes appearing days or even weeks before other neurological signs show up. Understanding when ringing in the ears deserves urgent attention requires knowing which kind of tinnitus you’re dealing with and what other symptoms accompany it.
The Type of Stroke That Affects Hearing
Most strokes affect the large arteries supplying the front part of the brain, producing symptoms people recognize: facial drooping, arm weakness, slurred speech. These strokes almost never cause ear ringing. The strokes that do involve auditory symptoms occur in the vertebrobasilar system, which supplies the brainstem, cerebellum, and inner ear. Because the blood supply to the entire auditory system originates from this network, blockages there can produce hearing loss, tinnitus, and dizziness.
The artery most closely linked to auditory symptoms is the anterior inferior cerebellar artery (AICA). Ischemic stroke in the AICA distribution is considered the leading cause of sudden audiovestibular loss of vascular origin.1PubMed Central. Recent Advances in Understanding Audiovestibular Loss of a Vascular Cause A stroke here typically causes vertigo, hearing loss, tinnitus, and coordination problems on one side of the body all at once.2PubMed. Recurrent audiovestibular disturbance initially mimicking Ménière’s disease in a patient with anterior inferior cerebellar infarction What makes this clinically tricky is that the auditory symptoms sometimes come first, before any of the “classic” neurological deficits appear.
Tinnitus as an Early Warning Before a Stroke
In one study of patients who went on to have confirmed AICA infarctions, roughly a third experienced an acute auditory syndrome as a prodrome, meaning a warning episode that preceded the full stroke by one to ten days.3PubMed. Auditory disturbance as a prodrome of anterior inferior cerebellar artery infarction These warning episodes took two forms: some patients had brief, recurrent episodes of hearing loss with or without tinnitus that lasted only minutes, while others had a single prolonged episode of hearing loss with or without tinnitus. The ringing in these prodromal episodes was identical to the tinnitus the patients later experienced during the actual stroke. In another case series, four patients had vertigo and acute auditory symptoms, including tinnitus, as their only symptom from one day to two months before the infarction was confirmed.4PubMed. Sudden deafness and anterior inferior cerebellar artery infarction
This is what makes the link between ear ringing and stroke medically meaningful. It’s not that tinnitus occurs during the main event (though it does). It’s that tinnitus and hearing changes can precede the stroke, providing a narrow window for early intervention. The mechanism is straightforward: the inner ear is extremely sensitive to drops in blood flow, and even partial or temporary blockage of the AICA or its branches can starve the cochlea of oxygen before the larger brainstem territory is affected.
Who Is Actually at Risk
Before anyone with ringing ears starts worrying about a stroke, some context is needed. Tinnitus is extremely common. Tens of millions of people experience it, and the vast majority have causes that are completely unrelated to cerebrovascular disease: noise exposure, age-related hearing loss, earwax buildup, jaw problems, and medication side effects account for the bulk of cases. A study of nearly 1,900 patients hospitalized for sudden sensorineural hearing loss found that only about 1.6% were ultimately diagnosed with an ischemic stroke during their stay.5PubMed Central. Early detection of stroke at the sudden sensorineural hearing loss stage Even among that specialized population of people with sudden hearing loss serious enough to be hospitalized, stroke was uncommon.
The patients who were at higher risk shared a specific profile: they had three or more traditional stroke risk factors (such as high blood pressure, diabetes, high cholesterol, or smoking), they had bilateral hearing loss rather than one-sided, their hearing loss was moderately severe to total, and imaging showed significant narrowing of major arteries in the brain.5PubMed Central. Early detection of stroke at the sudden sensorineural hearing loss stage Vertigo at the time of onset was also a significant predictor. So the typical person who develops ringing in one ear after a loud concert or during a stressful week is not in this risk category. The person who should be more concerned is the one with vascular risk factors who suddenly develops hearing loss, tinnitus, and dizziness together.
Pulsatile Tinnitus Is a Different Story
There’s a separate and important category of tinnitus that has a more direct relationship to stroke risk. Pulsatile tinnitus is the perception of a rhythmic, whooshing or thumping sound in the ear, usually in sync with the heartbeat. Unlike the steady ringing or buzzing of ordinary tinnitus, pulsatile tinnitus typically reflects actual blood flow that the ear is picking up. It affects an estimated three to five million Americans.6PubMed Central. Management of Vascular Causes of Pulsatile Tinnitus
The reason pulsatile tinnitus matters in a stroke conversation is that several of its underlying causes carry a genuine risk of stroke or hemorrhage. Seeking the cause of pulsatile tinnitus is essential because many of those causes pose a significant risk of hemorrhagic stroke, ischemic stroke, or blindness.6PubMed Central. Management of Vascular Causes of Pulsatile Tinnitus Conditions that can produce pulsatile tinnitus and also raise stroke risk include:
- Dural arteriovenous fistulas: Abnormal connections between arteries and veins in the membranes surrounding the brain. These small vascular lesions can cause persistent, one-sided pulsatile tinnitus that doesn’t respond to usual treatments.7PubMed Central. Cranial dural arteriovenous fistula as a rare cause of tinnitus – case report
- Carotid artery stenosis: Narrowing of the internal carotid artery from atherosclerotic plaque can create turbulent blood flow audible as pulsatile tinnitus.8PubMed Central. Disappeared pulsatile tinnitus related to petrous segment stenosis of the ICA after relief of the stenosis by stenting
- Carotid artery dissection: A tear in the wall of the carotid artery, which is a direct stroke risk. Pulsatile tinnitus has been reported in up to about a quarter of patients with internal carotid dissection.9PubMed Central. Spontaneous Internal Carotid Dissection Presenting With Pulsatile Tinnitus and Hearing Loss
The key distinction is that pulsatile tinnitus doesn’t necessarily mean a stroke is happening right now, but it can mean a condition is present that substantially increases the chance of one. That makes it a symptom that always warrants medical investigation, even if it seems mild.
Why These Cases Get Misdiagnosed
One of the frustrating realities of stroke-related auditory symptoms is that they closely resemble common inner-ear disorders. The combination of sudden hearing loss, tinnitus, and vertigo is the hallmark of Ménière’s disease, a chronic and nondangerous condition. Clinicians have documented cases in which patients with AICA strokes were initially diagnosed with Ménière’s disease because the early episodes looked identical: recurrent hearing loss and vertigo lasting several minutes, with no classic brainstem or cerebellar signs.2PubMed. Recurrent audiovestibular disturbance initially mimicking Ménière’s disease in a patient with anterior inferior cerebellar infarction The correct diagnosis only became apparent later, when the full stroke developed.
This overlap is why vascular risk factors matter so much in clinical decision-making. In an older patient with high blood pressure, diabetes, or known arterial disease who presents with sudden hearing loss and dizziness, the threshold for suspecting a vascular cause should be lower. In a younger person without those risk factors, inner-ear disorders remain far more likely. But the symptom profile alone doesn’t reliably distinguish between the two, which means doctors sometimes need imaging even when the presentation looks like a benign ear problem.
How Doctors Tell the Difference at the Bedside
When a patient shows up in an emergency department with sudden vertigo, hearing changes, and possibly tinnitus, clinicians need to decide quickly whether this is an inner-ear issue or a stroke. Brain imaging with MRI is the definitive tool, but even MRI can miss small posterior-circulation strokes in the first 24 to 48 hours. This is where a set of bedside eye-movement tests known as HINTS (head impulse, nystagmus, test of skew) becomes valuable. These three tests evaluate how the eyes move in response to head movements and can identify patterns consistent with a central (brain-based) cause versus a peripheral (inner-ear) cause.
When performed by specialists experienced in eye-movement assessment, the HINTS battery has been shown to identify acute strokes more accurately than even early MRI.10PubMed Central. Diagnosing Stroke in Acute Vertigo: The HINTS Family of Eye Movement Tests and the Future of the “Eye ECG” A systematic review and meta-analysis found that the sensitivity of HINTS for detecting stroke in patients with acute vestibular syndrome was around 97%, with an expanded version of the test reaching 99%.11The American Journal of Emergency Medicine. Using “HINTS family” to diagnose stroke in the acute vestibular syndrome: A systematic review and meta-analysis These numbers are impressive, but the accuracy depends heavily on the clinician’s skill. In general emergency departments where doctors haven’t been specifically trained in the technique, the results are less reliable. Still, HINTS represents one of the more promising developments in quickly sorting dangerous strokes from benign vertigo in the acute setting.
Brainstem Strokes and Central Tinnitus
The AICA territory isn’t the only stroke location that can cause tinnitus. Strokes affecting the brainstem more broadly can disrupt the central auditory pathways, the neural wiring that carries sound information from the ear to the brain’s processing centers. When these pathways are damaged, the result can include hearing loss, tinnitus, auditory hallucinations, and even hyperacusis, an abnormal sensitivity to everyday sounds. Because the blood supply to the auditory system originates from the vertebrobasilar system, hearing loss and tinnitus are common with vertebrobasilar territory ischemic stroke overall.12PubMed Central. Disabling tinnitus and third nerve palsy following pontine hemorrhage: Application of ICF framework
This is worth knowing because tinnitus caused by central auditory pathway disruption can behave differently from the tinnitus that comes from inner-ear damage. It may be harder to mask with external sounds, may be perceived as coming from inside the head rather than from one ear, and may persist even if the ear itself is functioning normally on hearing tests. Hemorrhagic strokes (bleeds) in the brainstem, though rarer than ischemic strokes, can also produce disabling tinnitus alongside other neurological deficits like eye-movement problems and limb weakness.
Recovery of Hearing and Tinnitus After Stroke
If a stroke does cause hearing loss and tinnitus, the natural question is whether these symptoms improve over time. The evidence here is more encouraging than many patients expect. In a prospective study following patients with hearing loss due to vertebrobasilar ischemic stroke for at least a year, nearly 80% experienced partial or complete recovery of their hearing.13Journal of the Neurological Sciences. Recent advances in acute hearing loss due to posterior circulation ischemic stroke However, the severity of the initial hearing loss mattered considerably: patients with profound hearing loss had significantly lower improvement rates than those with milder deficits. Having multiple vascular risk factors was also an adverse prognostic sign.14Journal of the Neurological Sciences. Long-term prognosis for hearing recovery in stroke patients presenting vertigo and acute hearing loss
Tinnitus recovery after stroke is less well studied than hearing recovery, partly because tinnitus is harder to measure objectively. Some patients find that as hearing improves, the tinnitus diminishes in parallel. Others are left with persistent ringing even after hearing partially returns. There are no large systematic studies specifically addressing tinnitus prognosis after stroke, so expectations should be calibrated with some uncertainty.
When to Seek Emergency Care
Given that tinnitus alone is extremely unlikely to indicate a stroke, the practical question is: when should ringing in the ears prompt an urgent trip to the emergency room? The answer lies almost entirely in what else is happening at the same time. Tinnitus that arrives alongside sudden hearing loss, vertigo, difficulty walking, double vision, facial numbness, or severe headache warrants immediate evaluation. These combinations suggest possible vertebrobasilar involvement, and time matters with stroke treatment just as much in the posterior circulation as in the front of the brain.
Pulsatile tinnitus, the heartbeat-synchronous whooshing kind, is in a different category. It doesn’t necessarily require an emergency visit unless it arrives suddenly alongside neurological symptoms. But it does need investigation, ideally with imaging of the head and neck blood vessels, to rule out the vascular conditions described above. If you’ve been hearing your heartbeat in your ear for weeks or months, mention it to your doctor even if it doesn’t seem urgent. The conditions that cause it are treatable, and the stroke risk some of them carry is preventable.
Medication Side Effects That Muddy the Picture
One reason people worry about tinnitus is that it can appear suddenly and without obvious explanation. But medications are a far more common culprit than vascular disease. High doses of aspirin and other salicylates are well-known to cause temporary tinnitus and hearing loss. Salicylate-induced tinnitus involves a reduction in the ear’s own output signals, followed by the brain’s auditory system turning up its internal volume, a phenomenon called central gain.15PubMed Central. Review: Neural Mechanisms of Tinnitus and Hyperacusis in Acute Drug-Induced Ototoxicity This amplification of weak signals from a struggling cochlea is thought to contribute to both the tinnitus and the sound sensitivity that sometimes accompanies it. Certain antibiotics, loop diuretics, and chemotherapy drugs can do the same thing, sometimes permanently.
The relevance here is that some of the medications used to prevent or treat strokes, including aspirin, can themselves cause tinnitus. A person taking daily aspirin for cardiovascular prevention who develops ringing in the ears is overwhelmingly more likely to be experiencing a medication side effect than a stroke symptom. Recognizing this can save a lot of unnecessary anxiety, though it’s always worth confirming the cause with a physician, especially if the tinnitus arrives alongside other new symptoms.
Dural Arteriovenous Fistulas and Diagnostic Complexity
Among the vascular causes of pulsatile tinnitus, dural arteriovenous fistulas deserve particular attention because they’re both treatable and notoriously easy to miss on routine imaging. A fistula between a dural artery and a venous sinus creates abnormal blood flow that the patient hears as a rhythmic pulsing. These lesions are usually small, and standard imaging may not reveal them unless the radiologist is specifically looking. In one reported case, a fistula presented as pulsatile tinnitus that appeared to be coming from the opposite ear due to the masking effect of coexisting hearing loss on that side.16PubMed. Dural arteriovenous fistula presenting as paradoxical contralateral pulsatile tinnitus due to contralateral otosclerosis-induced mixed hearing loss In other cases, fistulas have been confused with abnormalities of the sigmoid sinus wall, a venous structure near the ear, leading clinicians down the wrong diagnostic path.17PubMed. Intracranial Dural Arteriovenous Fistula Can Mimic Sigmoid Sinus Wall Anomalies Induced Pulsatile Tinnitus: Caution Before Considering It’s Venous
The stakes of missing a dural fistula go beyond persistent tinnitus. Some of these lesions carry a risk of intracranial hemorrhage, which is itself a type of stroke. When a fistula is identified, treatment options include endovascular embolization (sealing off the abnormal connection from within the blood vessel) or, less commonly, surgery. The tinnitus often resolves after successful treatment. For anyone with persistent, one-sided pulsatile tinnitus that doesn’t go away and doesn’t have an obvious explanation, CT angiography or MR angiography focused on the vascular anatomy of the skull base is the appropriate next step in the workup.