Vertigo attacks are most commonly caused by problems in the inner ear, where tiny structures control your sense of balance. Roughly one in five adults experiences vertigo at some point, and the single most frequent culprit is a condition called benign paroxysmal positional vertigo, or BPPV. But several other conditions, from fluid buildup in the ear to migraines, can also trigger that unmistakable spinning sensation.
BPPV: The Most Common Cause
Inside your inner ear, small calcium crystals help you sense gravity and movement. In BPPV, some of these crystals break loose and drift into one of the semicircular canals, the fluid-filled tubes your body uses to detect head rotation. Once there, the crystals shift every time you move your head, sending false motion signals to your brain. The result is a sudden, intense burst of spinning that typically lasts 30 to 60 seconds and then fades.
BPPV episodes are triggered by specific head movements: rolling over in bed, tilting your head back to look up, or bending forward. The crystals detach more often as people age, due to gradual wear on the inner ear structures, though a head injury or prolonged bed rest can also set it off. The good news is that BPPV is very treatable. A series of guided head movements (called repositioning maneuvers) can move the crystals back where they belong, often resolving the problem in one or two sessions.
Meniere’s Disease
Meniere’s disease causes vertigo attacks that last much longer than BPPV, anywhere from 20 minutes to 12 hours per episode. It develops when excess fluid accumulates in the inner ear, increasing pressure and distorting the signals your balance and hearing organs send to the brain. Why this fluid buildup happens isn’t fully understood, but it likely involves an imbalance between how much inner ear fluid your body produces and how much it reabsorbs.
Vertigo is just one piece of Meniere’s. The condition is diagnosed when someone has repeated spontaneous vertigo episodes (at least two) along with hearing loss in one ear and fluctuating symptoms like ringing in the ear (tinnitus) or a feeling of fullness or pressure. The hearing loss tends to affect low and mid-range frequencies first, meaning deeper sounds become harder to hear before higher-pitched ones do.
Salt, caffeine, and alcohol restriction is widely recommended as a first-line approach for managing Meniere’s. The theory behind limiting salt is straightforward: high sodium intake can shift electrolyte concentrations in the blood, which may affect the volume and composition of inner ear fluid and trigger attacks. Caffeine and alcohol can constrict blood vessels, potentially reducing blood flow to the inner ear. That said, a Cochrane review found no randomized controlled trial evidence to definitively confirm or disprove whether these dietary changes work. Many patients still report benefit, and the restrictions carry little risk.
Vestibular Neuritis and Labyrinthitis
These two conditions are closely related and both involve inflammation of the inner ear or the nerve connecting it to the brain, usually following a viral infection. The key difference is hearing. Vestibular neuritis affects only the balance portion of the inner ear nerve, so it causes vertigo without hearing loss. Labyrinthitis affects the entire inner ear nerve, including the hearing side, so it causes both vertigo and hearing changes.
Unlike BPPV’s brief spins, vestibular neuritis and labyrinthitis tend to produce a single severe episode of vertigo that can last days, sometimes with lingering unsteadiness for weeks. Most people recover fully, though the timeline varies. The vertigo gradually improves as the brain learns to compensate for the damaged nerve signals.
Vestibular Migraine
Migraine doesn’t always mean a headache. Vestibular migraine is one of the more common yet underrecognized causes of recurrent vertigo. Episodes can last anywhere from 5 minutes to 72 hours, and at least half of the episodes must be accompanied by migraine features to meet the diagnostic criteria: a one-sided, pulsating headache that worsens with physical activity, sensitivity to light and sound, or a visual aura.
Some people experience the vertigo without any headache at all during a given episode, which is part of why it’s frequently missed. Nausea, vomiting, and heightened motion sensitivity are common companions. If you have a personal history of migraines and develop unexplained recurrent vertigo, vestibular migraine is worth discussing with your doctor. Triggers often overlap with typical migraine triggers: stress, sleep disruption, certain foods, and hormonal changes.
How Attack Duration Points to the Cause
One of the most useful clues for identifying the cause of vertigo is how long each episode lasts. The pattern breaks down fairly cleanly:
- Seconds to under one minute: BPPV. The spinning is intense but brief and always tied to a change in head position.
- 20 minutes to 12 hours: Meniere’s disease. Episodes come with ear symptoms like hearing changes, tinnitus, or fullness.
- 5 minutes to 72 hours: Vestibular migraine. The wide range and overlap with Meniere’s can make this harder to pin down, but migraine features help distinguish it.
- Days to weeks (continuous): Vestibular neuritis or labyrinthitis. A single prolonged episode rather than recurrent attacks.
Keeping a simple log of when attacks happen, how long they last, and what you were doing beforehand can be extremely helpful for a clinician trying to narrow down the cause.
Less Common but Serious Causes
A small, slow-growing tumor called a vestibular schwannoma (sometimes called an acoustic neuroma) can press on the hearing and balance nerves, causing one-sided hearing loss, tinnitus, and dizziness. Symptoms typically appear between the ages of 30 and 60, but early detection can be difficult because the signs start subtly and build gradually over months or years. Any progressive hearing loss in one ear that doesn’t have an obvious explanation warrants further evaluation.
Certain medications can also damage the inner ear and trigger vertigo. Aminoglycoside antibiotics (used for serious bacterial infections) and some chemotherapy drugs are among the most well-known offenders. Even high-dose aspirin can cause reversible balance problems and ringing in the ears. If vertigo begins shortly after starting a new medication, the timing is worth noting.
When Vertigo Could Signal a Stroke
Most vertigo comes from the inner ear and, while unpleasant, isn’t dangerous. Rarely, vertigo is caused by a problem in the brainstem or cerebellum, the parts of the brain that process balance signals. A stroke or reduced blood flow in these areas can produce vertigo that feels similar to an inner ear problem but carries very different stakes.
Several red flags suggest a central (brain-related) cause rather than a peripheral (ear-related) one. Vertical eye movements that you can’t control point to a central origin, as does nystagmus (involuntary eye jerking) that changes direction when you look in different directions. In emergency settings, clinicians use a bedside test called HINTS, which checks how the eyes respond to quick head movements, the pattern of any involuntary eye motion, and whether one eye sits higher than the other. This three-part exam can distinguish inner ear vertigo from a stroke with high accuracy.
For anyone experiencing vertigo, the symptoms that demand urgent attention are the same ones associated with stroke in general: sudden weakness or numbness on one side of the body, difficulty speaking or slurred speech, double vision, trouble walking, or a severe headache unlike anything you’ve experienced before. The FAST check (facial asymmetry, arm drift, speech disturbance, time of onset) applies here just as it does with any other stroke presentation.