Vertigo is a false sensation of spinning or movement, and it stems from a problem somewhere in your balance system, most often the inner ear. About 15% to 20% of adults experience dizziness or vertigo in any given year, making it one of the most common reasons people visit a doctor. The causes range from harmless (loose crystals in your ear canal) to serious (stroke), so understanding where vertigo comes from helps you recognize what you’re dealing with.
How Your Balance System Works
Your sense of balance depends on three inputs working together: your inner ear (which detects head position and rotation), your eyes, and sensors in your joints and muscles that tell your brain where your body is in space. Your brain constantly compares signals from all three systems. When one sends conflicting information, you feel dizzy or off-balance. When the conflict is severe, especially from the inner ear, you experience true vertigo: the unmistakable sensation that the room is spinning around you.
The inner ear contains fluid-filled semicircular canals that detect rotation and two small organs (the utricle and saccule) that sense gravity and straight-line movement. Disruptions to any of these structures, or to the nerve connecting them to the brain, are responsible for the vast majority of vertigo cases.
BPPV: The Most Common Cause
Benign paroxysmal positional vertigo, or BPPV, is by far the leading cause. It happens when tiny calcium crystals called otoconia break loose from their normal position in the utricle and drift into one of the semicircular canals. Once displaced, these crystals settle at the lowest point of the canal and cause fluid to shift every time you move your head, sending a false signal that your head is rotating.
The hallmark of BPPV is brief, intense spinning triggered by specific head movements: rolling over in bed, tilting your head back, or bending forward. Episodes typically last less than a minute. Between episodes, you may feel fine or slightly unsteady. Without treatment, symptoms often fade over days to weeks, and the condition sometimes resolves on its own.
The good news is that BPPV responds remarkably well to a simple repositioning technique called the Epley maneuver. A clinician guides your head through a series of positions designed to roll the loose crystals out of the semicircular canal and back where they belong. Studies show cure rates around 87% to 90% after just one week. You can also learn a self-administered version at home with similar success.
Ménière’s Disease
Ménière’s disease causes episodes of vertigo lasting 20 minutes to several hours, paired with fluctuating hearing loss (usually in one ear), ringing in the ear, and a feeling of fullness or pressure. It’s driven by a buildup of fluid pressure inside the inner ear, a condition called endolymphatic hydrops. When the pressure gets high enough, it ruptures the thin membrane separating two types of inner ear fluid. The resulting chemical mix disrupts the vestibular nerve, temporarily knocking out balance function on that side and triggering a vertigo attack.
The fluid pressure buildup also explains the hearing loss pattern. The tightly wound tip of the inner ear’s hearing organ is more sensitive to pressure changes than the wider base, so low-frequency hearing is affected first. This is why people with Ménière’s often notice that voices sound muffled or that they struggle with low-pitched sounds before higher ones.
Ménière’s disease is, by definition, idiopathic, meaning the underlying cause of the fluid imbalance is unknown. When the same fluid buildup is traced to a known condition like thyroid disease, it’s called Ménière’s syndrome, and treatment focuses on that root cause. For true Ménière’s disease, management centers on reducing the frequency and severity of attacks, often through dietary salt restriction, medication, and in stubborn cases, procedures to reduce fluid pressure or dampen the nerve signal from the affected ear.
Vestibular Neuritis and Labyrinthitis
These two conditions are closely related and both typically follow a viral infection. Vestibular neuritis is inflammation of the vestibular nerve, the nerve that carries balance signals from the inner ear to the brain. It causes sudden, severe, continuous vertigo that can last days, along with nausea and difficulty walking. Crucially, hearing remains normal.
Labyrinthitis involves inflammation of the entire inner ear labyrinth, which houses both balance and hearing structures. It produces the same prolonged vertigo as vestibular neuritis but also causes hearing loss or ringing in the affected ear. That distinction, whether hearing is affected, is the key difference between the two.
Both conditions gradually improve as the brain learns to compensate for the damaged side, a process that can take weeks. Vestibular rehabilitation exercises speed this recovery by retraining the brain to interpret balance signals correctly.
Vestibular Migraine
Migraine doesn’t just cause headaches. It can also trigger vertigo episodes even without head pain. Vestibular migraine is one of the most common causes of recurrent vertigo, and it’s diagnosed when someone with a history of migraines experiences moderate to severe vertigo episodes lasting anywhere from five minutes to 72 hours.
The duration varies wildly from person to person. Roughly 30% of people with vestibular migraine have episodes lasting minutes, 30% experience attacks for hours, and another 30% deal with symptoms stretching over several days. The remaining 10% get very brief attacks lasting just seconds, often triggered by head movement or visual stimulation, that recur in clusters.
Vestibular migraine can be tricky to recognize because the vertigo may show up without a headache, or the headache may come hours before or after the dizziness. Treatment follows the same general approach as other migraines: identifying triggers, lifestyle modifications, and preventive medications for people with frequent episodes.
Stroke and Other Central Causes
Most vertigo originates in the inner ear (peripheral vertigo), but a small percentage comes from problems in the brain itself (central vertigo). The most urgent of these is stroke, specifically a stroke in the brainstem or cerebellum, the brain regions that process balance information. This type of stroke can present with sudden vertigo as its primary or only symptom, making it easy to mistake for an inner ear problem.
Certain features help distinguish dangerous central vertigo from the more benign peripheral kind. With BPPV, for example, there’s a brief delay between a head movement and the onset of spinning, and the nystagmus (involuntary eye movements) follows a predictable pattern. With central causes, the eye movements often look different: they may start instantly with no delay, change direction, or point downward. Doctors use a bedside eye exam called the HINTS test (Head Impulse, Nystagmus type, Test of Skew) to tell the difference. In studies, this three-part test identified central causes with roughly 96% sensitivity and 94% specificity, outperforming even early brain imaging in some cases.
Other central causes include tumors near the balance nerve (acoustic neuroma), multiple sclerosis affecting brainstem pathways, and vascular conditions that reduce blood flow to the brain’s balance centers.
Medications That Cause Vertigo
Vertigo is a side effect of a surprisingly long list of medications. Common culprits include certain blood pressure drugs, antibiotics (particularly a class called aminoglycosides), seizure medications, anti-inflammatory drugs like naproxen and prednisone, acid reflux medications, and some osteoporosis drugs. Even widely used medications like codeine, some sleep aids, and lithium can trigger vertigo.
Some of these medications are also directly toxic to the inner ear, meaning they can cause lasting damage to balance and hearing structures rather than just temporary dizziness. If vertigo starts or worsens after beginning a new medication, that timing is an important clue worth discussing with your prescriber. In many cases, adjusting the dose or switching to an alternative resolves the problem.
Less Common Triggers
Several other conditions can produce vertigo, though they account for a smaller share of cases. Head injuries can dislodge the same calcium crystals responsible for BPPV or damage inner ear structures directly. Ear infections, particularly middle ear infections that spread to the inner ear, can disrupt balance. Prolonged bed rest or immobility sometimes leads to deconditioning of the balance system, causing dizziness when you start moving again. Anxiety disorders can amplify or even mimic vertigo, creating a frustrating cycle where dizziness fuels anxiety and anxiety worsens dizziness.
Low blood pressure, dehydration, and anemia are often lumped in with vertigo, but these more commonly cause lightheadedness (a feeling of nearly fainting) rather than true spinning. The distinction matters because the workup and treatment are completely different.