Vertigo happens when your brain receives faulty signals about your body’s position in space, almost always because something has gone wrong in the inner ear’s balance system. It’s not a disease itself but a symptom, and the specific way you “get” it depends on which part of that system breaks down. The most common cause by far is tiny calcium crystals drifting out of place inside your ear, but infections, fluid buildup, migraines, and even certain medications can trigger the same spinning sensation.
How Your Balance System Works
Your inner ear contains a network of fluid-filled tubes and chambers called the vestibular labyrinth. Three semicircular canals, arranged at different angles, detect rotation of your head. Inside these canals, a fluid called endolymph shifts whenever you move. That shifting fluid bends microscopic hair cells embedded in a gel-like structure at the end of each canal. When those hair cells bend, they fire electrical signals through the vestibular nerve (the eighth cranial nerve) to your brain, telling it exactly which direction your head is turning and how fast.
Your brain cross-references these signals with information from your eyes and from pressure sensors in your joints and muscles. When all three sources agree, you feel steady. Vertigo kicks in when the inner ear sends a signal that doesn’t match what your eyes and body are reporting. Your brain interprets the mismatch as motion, so you feel like you or the room is spinning even though nothing is actually moving.
Loose Crystals in the Ear (BPPV)
Benign paroxysmal positional vertigo, or BPPV, is the single most common cause of vertigo. It starts when tiny calcium carbonate crystals called otoconia break free from a membrane in the utricle, a small organ in the inner ear that normally senses gravity. Once loose, these crystals drift into one of the semicircular canals, where they don’t belong.
When you change head position (rolling over in bed, looking up at a shelf, bending forward), the crystals tumble to the lowest point of the canal. That movement drags fluid along with it, bending hair cells and sending a burst of false rotation signals to your brain. The result is a brief but intense spinning episode, usually lasting less than a minute, that stops once the crystals settle. People often notice it first thing in the morning when they sit up or turn over.
Doctors confirm BPPV with a simple bedside test called the Dix-Hallpike maneuver. You sit on an exam table while a provider turns your head 45 degrees to one side, then quickly guides you to lie back with your head hanging slightly off the edge. If displaced crystals are present, they’ll see your eyes make rapid involuntary movements called nystagmus. That eye movement confirms the diagnosis. Why the crystals come loose in the first place isn’t always clear. Head injuries, aging, and prolonged bed rest are known triggers, but many cases have no obvious cause.
Inner Ear Infections and Inflammation
A viral infection can inflame either the vestibular nerve or the inner ear itself, and the distinction matters. Vestibular neuritis targets only the nerve that carries balance signals. It produces severe, sustained vertigo that can last days, but your hearing stays normal because the hearing nerve isn’t affected. Labyrinthitis involves inflammation of the inner ear’s labyrinth, which houses both balance and hearing structures. It causes the same intense vertigo but also brings hearing loss or ringing in the ear (tinnitus), and that hearing damage is often permanent.
Both conditions typically follow an upper respiratory infection or other viral illness. The vertigo from either one tends to be much more prolonged than BPPV. Rather than brief episodes triggered by head movement, you may feel continuously dizzy for several days, with gradual improvement over weeks as your brain learns to compensate for the damaged signals.
Fluid Buildup: Ménière’s Disease
Ménière’s disease develops when excess fluid accumulates in the inner ear’s endolymph system. That fluid buildup distorts both balance and hearing signals headed to your brain. Nobody knows exactly why the fluid accumulates, but the pattern it produces is distinctive: episodes of vertigo lasting 20 minutes to several hours, accompanied by a feeling of fullness or pressure in one ear, fluctuating hearing loss (especially in lower pitches), and tinnitus that people often describe as a whirring or whooshing sound.
Early on, hearing may return to normal between episodes. Over time, without management, the hearing loss can become permanent. Ménière’s tends to affect one ear, and episodes can be separated by weeks or months. Stress, high salt intake, and caffeine are commonly reported triggers, though the underlying mechanism remains poorly understood.
Vestibular Migraine
Migraine doesn’t just cause headaches. In some people, it disrupts the brain’s processing of balance signals, producing vertigo episodes that can last anywhere from five minutes to three days. This is called vestibular migraine, and it’s diagnosed when someone with a history of migraines experiences repeated bouts of moderate to severe vertigo that can’t be explained by an inner ear problem.
The vertigo can take several forms: a spontaneous sensation of spinning, dizziness triggered by head movement, or vertigo brought on by busy visual environments like scrolling screens or crowded stores. A headache doesn’t have to accompany every episode, which is part of what makes vestibular migraine tricky to recognize. Some people experience the vertigo with no headache at all, while others get both simultaneously. Sensitivity to light and sound during episodes is a common clue.
Brain-Related Causes
Most vertigo originates in the inner ear (peripheral vertigo), but a small percentage comes from problems in the brain itself (central vertigo). A stroke affecting the cerebellum or brainstem, multiple sclerosis lesions, or tumors pressing on balance-related brain structures can all produce vertigo. Central vertigo is far less common than inner ear vertigo, but it’s more dangerous.
The two types feel different and behave differently. Peripheral vertigo from the inner ear tends to be intense but short-lived, is usually triggered by head movement, and comes with a characteristic pattern of eye movements. Central vertigo is often less dramatically “spinning” but more persistent, and it frequently appears alongside other neurological symptoms: trouble walking, double vision, slurred speech, or weakness on one side of the body. Emergency physicians use specific eye-movement tests to tell the two apart, because a cerebellar stroke can initially look a lot like a simple inner ear problem.
Medications That Trigger Vertigo
A surprisingly wide range of medications list vertigo as a side effect. Some directly damage inner ear structures (these are called ototoxic drugs), while others affect the brain or blood pressure in ways that produce dizziness and spinning sensations.
- Blood pressure and heart medications: drugs that lower blood pressure can reduce blood flow to the inner ear or brain, particularly when standing up quickly.
- Certain antibiotics: aminoglycoside antibiotics are well known for damaging inner ear hair cells. Some macrolide antibiotics can also cause vertigo.
- Anti-seizure drugs: medications like phenytoin and pregabalin commonly affect balance processing in the brain.
- Anti-inflammatory drugs: both prescription options like celecoxib and common over-the-counter drugs like naproxen can trigger vertigo in some people.
- Sedatives and psychiatric medications: benzodiazepines, lithium, and certain antipsychotics all affect the central nervous system in ways that can produce vertigo.
If vertigo starts shortly after beginning a new medication, that timing is worth noting. In many cases, the vertigo resolves once the medication is adjusted or stopped.
Other Contributing Factors
Beyond the major causes, several other situations can produce vertigo or make existing vertigo worse. Head injuries, even mild concussions, can shake loose the calcium crystals that cause BPPV or damage vestibular nerve fibers directly. Prolonged bed rest reduces the vestibular system’s calibration, which is why hospitalized patients sometimes develop positional vertigo during recovery. Aging naturally degrades the hair cells and nerve connections in the inner ear, making older adults more susceptible to balance problems in general.
Anxiety doesn’t directly cause true spinning vertigo, but it can amplify dizziness and create a feedback loop where fear of an episode makes symptoms worse. People who’ve had one bad vertigo attack sometimes become hypervigilant about head movements, which paradoxically slows the brain’s ability to recalibrate and recover.