Vertigo is a symptom, not a disease itself, and it points to a problem somewhere in the balance system that connects your inner ear to your brain. The most common cause by far is a treatable inner ear condition called BPPV, but vertigo can also signal infections, chronic ear disorders, migraines, and in rare cases, stroke. Understanding which condition is behind your vertigo depends largely on how long episodes last, what triggers them, and whether other symptoms show up alongside the spinning.
How Your Balance System Creates Vertigo
Your inner ear contains tiny calcium carbonate crystals that sit on a bed of hair-like sensors. These crystals act as weights, sliding across the sensors when you tilt or accelerate your head, telling your brain which direction you’re moving. Separately, three fluid-filled loops (semicircular canals) detect rotation by sensing fluid movement inside them.
Vertigo happens when this system sends signals that don’t match what your eyes and body are experiencing. Sometimes the problem is mechanical, like crystals ending up where they shouldn’t be. Sometimes it’s inflammation damaging the nerve that carries balance signals. And sometimes the brain itself misinterprets normal signals. Where the breakdown occurs determines what condition you’re dealing with.
BPPV: The Most Common Cause
Benign paroxysmal positional vertigo (BPPV) is the single most frequent cause of vertigo. It happens when those small calcium crystals break loose from their normal position and drift into one of the semicircular canals, usually the posterior canal. Once there, the crystals mimic fluid movement, sending a false signal to your brain that you’re spinning when you’re actually still. This produces intense but brief vertigo, involuntary eye movements, and nausea.
The hallmark of BPPV is that episodes are triggered by specific head movements: rolling over in bed, looking up, or bending forward. Each episode typically lasts less than a minute, though it can feel much longer. Diagnosis involves a positioning test where a clinician turns your head in specific directions while you lie back. This test has about 80% sensitivity and 95% specificity for catching posterior canal BPPV, making it one of the more reliable bedside tests in medicine. Treatment involves guided head movements that reposition the crystals back where they belong, and it often works in one or two sessions.
Inner Ear Infections and Inflammation
Two closely related conditions, vestibular neuritis and labyrinthitis, cause vertigo through inflammation of the inner ear or the nerve connecting it to the brain. Unlike BPPV’s brief episodes, these produce severe, continuous vertigo that starts abruptly and lasts for days or even weeks. Walking in a straight line becomes difficult or impossible, and nausea and vomiting can be intense enough to cause dehydration and exhaustion.
The key difference between the two: vestibular neuritis affects only balance, while labyrinthitis also damages hearing in the affected ear, causing muffled sound or ringing. Both are usually triggered by a viral infection. Most people recover gradually as the brain learns to compensate for the damaged signals, though this process can take weeks to months.
Ménière’s Disease
Ménière’s disease causes repeated episodes of vertigo lasting anywhere from 20 minutes to 12 hours, paired with hearing loss, ringing in the ear (tinnitus), and a feeling of pressure or fullness in one ear. These symptoms fluctuate, sometimes worsening during an episode and partially improving between attacks.
Diagnosis requires at least two spontaneous vertigo episodes in that time range, documented hearing loss in the low-to-mid frequency range on one side, and fluctuating ear symptoms that can’t be explained by another condition. The hearing loss in Ménière’s tends to affect lower-pitched sounds first, which distinguishes it from age-related hearing loss that typically starts with high frequencies. Over time, hearing loss can become permanent even between episodes. The condition is thought to involve abnormal fluid pressure in the inner ear, though the exact trigger remains unclear.
Vestibular Migraine
Migraine doesn’t just cause headaches. Vestibular migraine produces vertigo, dizziness, and balance problems that can last minutes, hours, or occasionally days. The surprising part: these episodes can happen without any headache at all. This makes vestibular migraine easy to miss or misdiagnose.
People with vestibular migraine often have a personal or family history of migraine headaches, and their vertigo episodes may come with light sensitivity, sound sensitivity, or visual disturbances. The overlap with other conditions is significant. Vestibular migraine can look similar to Ménière’s disease or even a transient ischemic attack (mini-stroke), which is why getting the pattern of episodes right matters for diagnosis.
Medications That Cause Vertigo
Certain medications damage the inner ear as a side effect, a phenomenon called ototoxicity. This can produce dizziness, balance problems when walking or climbing stairs, and lightheadedness. The drug classes most likely to cause these problems include:
- Aminoglycoside antibiotics (used for serious bacterial infections), which are among the most well-known ototoxic drugs
- Platinum-based chemotherapy drugs, particularly cisplatin and carboplatin
- Loop diuretics (water pills used for fluid retention and high blood pressure)
- High-dose aspirin, which can cause reversible dizziness and ringing
- Quinine, used to treat malaria
Ototoxic damage is sometimes reversible when the medication is stopped, but in other cases, particularly with aminoglycosides and chemotherapy, the damage can be permanent. If you develop new dizziness or balance issues while on any of these medications, that’s worth raising promptly with whoever prescribed them.
Less Common Structural Causes
A perilymphatic fistula is a tear in the thin membrane separating the middle and inner ear. It causes ear fullness, hearing loss, and vertigo, and it can result from head trauma, ear injuries, rapid pressure changes (from flying, scuba diving, or heavy lifting), or even blowing your nose extremely hard. Exposure to loud noises close to the ear, like gunfire, is another trigger.
Acoustic neuromas, slow-growing benign tumors on the nerve connecting the inner ear to the brain, can also produce vertigo alongside gradual hearing loss on one side. These are rare but important to identify because they grow slowly and are treatable when caught early. Cholesteatomas, abnormal skin growths in the middle ear from repeated infections, can erode into the inner ear and cause vertigo as well.
When Vertigo Signals a Stroke
This is the scenario that worries most people, and rightly so. Strokes affecting the brainstem or cerebellum can present as sudden vertigo, and research published by the American Heart Association found that isolated vertigo is the most common warning symptom before a stroke in the vertebrobasilar arteries. It’s rarely diagnosed correctly as a vascular symptom at first contact.
The challenge is that fewer than 20% of stroke patients who present with sudden vertigo have the obvious neurological signs you might expect, like arm weakness or facial drooping. Instead, clinicians rely on specific eye movement tests to distinguish inner ear vertigo from a stroke. Warning signs that suggest a stroke rather than a benign cause include: new difficulty speaking or slurring words, inability to coordinate limb movements (reaching for something and missing it), severe imbalance where you can’t sit upright without support, double vision, or numbness on one side of the body.
Cerebellar hemorrhages, while serious, are uncommon. Only about 5% of stroke-related vertigo cases involve bleeding rather than a clot. They rarely present as isolated dizziness and typically come with clear neurological deficits like slurred speech. Still, any new, severe vertigo with neurological symptoms warrants emergency evaluation, because rapid treatment for stroke dramatically improves outcomes.