The main cause of vertigo is a condition called benign paroxysmal positional vertigo, or BPPV. It accounts for roughly 1 in 5 cases among the estimated 33 million American adults who experience dizziness or balance problems each year. BPPV happens when tiny calcium crystals inside your inner ear break loose and end up where they don’t belong, sending false motion signals to your brain.
How BPPV Triggers Vertigo
Deep inside each ear, you have a small sensory organ called the utricle that helps you detect gravity and linear movement. The utricle is lined with microscopic calcium crystals called otoconia. In BPPV, some of these crystals detach and drift into the semicircular canals, the fluid-filled tubes your body uses to sense head rotation.
Once loose crystals settle into a canal, they shift with gravity every time you move your head. That movement pushes fluid across nerve endings that normally only fire when your head is actually spinning. Your brain receives a rotation signal from one ear but not the other, and the mismatch produces the classic spinning sensation of vertigo. The episodes are usually brief, lasting seconds to a few minutes, and are triggered by specific head movements: rolling over in bed, tilting your head back, or looking up.
Why BPPV Is So Treatable
Because the problem is mechanical (crystals in the wrong place), the fix is also mechanical. A guided series of head movements called the Epley maneuver works by using gravity to coax the loose crystals out of the semicircular canal and back into the utricle, where they can be reabsorbed. A meta-analysis of six studies found the Epley maneuver resolved vertigo symptoms in about 74% of people after a single treatment, a success rate roughly six and a half times better than doing nothing. Many people feel relief within one or two sessions performed by a clinician or physical therapist, though some need a few more rounds.
Other Common Causes of Vertigo
While BPPV is the most frequent culprit, several other conditions affect the inner ear or the nerve connecting it to the brain.
Vestibular Neuritis
This is inflammation of the vestibular nerve, almost always triggered by a viral infection. The list of associated viruses is long: influenza, COVID-19, herpes simplex (the cold sore virus), measles, mumps, and others. Unlike BPPV’s brief spinning spells, vestibular neuritis typically causes severe, continuous vertigo that lasts days. Most people recover fully within a few weeks, though some experience lingering imbalance for months or, in rare cases, years.
Ménière’s Disease
Ménière’s disease involves excess fluid buildup in the inner ear, which disrupts both hearing and balance signals. Episodes last anywhere from 20 minutes to 24 hours and come with a distinctive combination of vertigo, fluctuating hearing loss, ringing in the ear, and a sensation of fullness or pressure. It is far less common than BPPV. In national survey data, features matching Ménière’s disease appeared in only about 1.4% of adults reporting dizziness, compared to nearly 21% for BPPV.
Vestibular Migraine
Migraine doesn’t just cause headaches. Some people experience moderate to severe vertigo episodes lasting anywhere from five minutes to three days, with or without head pain. To qualify as vestibular migraine, at least half of the episodes need to come alongside typical migraine features: one-sided or pulsating headache, sensitivity to light and sound, or visual aura. It’s frequently confused with Ménière’s disease because the two conditions can look similar, and distinguishing between them remains one of the trickier diagnostic challenges in vestibular medicine.
Peripheral vs. Central Vertigo
All the conditions above are “peripheral,” meaning the problem originates in the inner ear or the nerve leading from it. Central vertigo, by contrast, comes from the brain itself, often the brainstem or cerebellum. Causes include stroke, tumors, and multiple sclerosis. Central vertigo is much less common but more serious.
There are practical differences you can notice. With peripheral vertigo, the room tends to spin in one direction, the sensation fades when you fix your gaze on something, and you can usually still walk, even if unsteadily. Central vertigo often produces nystagmus (involuntary eye movements) that doesn’t calm down when you focus, along with severe imbalance that makes standing or walking nearly impossible. Neurological symptoms like slurred speech, weakness on one side, vision changes, or numbness point toward a brain-based cause.
One important detail: isolated vertigo is the most common warning symptom before a stroke affecting the back of the brain, and it is rarely recognized as vascular at first contact. Fewer than 20% of stroke patients presenting with acute vertigo have obvious neurological signs like facial drooping or arm weakness. Sudden, severe, or sustained head or neck pain alongside vertigo warrants urgent medical attention.
Medications That Can Cause Vertigo
More than 200 medications can potentially damage the inner ear, a problem called ototoxicity. The classes most commonly linked to vertigo and hearing changes include certain intravenous antibiotics used for serious bacterial infections, some chemotherapy drugs, and loop diuretics (a type of water pill that helps the body shed excess fluid). Even high doses of aspirin can affect inner ear function. Environmental exposures to mercury, lead, and carbon monoxide carry similar risks, though these are far less common triggers.
Why Vertigo Gets More Common With Age
The inner ear’s balance structures gradually degrade over time, making older adults more susceptible to conditions like BPPV. The otoconia crystals become more brittle and more likely to detach. At the same time, the brain’s ability to compensate for conflicting balance signals slows down, and vision and joint sensation (both of which help you stay upright) also decline. The practical consequence is that vertigo becomes a significant fall risk. Balance problems are one of the leading reasons older adults fall, and falls are the top cause of injury in people over 65. If vertigo episodes become frequent, vestibular rehabilitation, a form of physical therapy designed to retrain the brain’s balance processing, can meaningfully reduce both symptoms and fall risk.