Vertigo comes from a malfunction in your body’s balance system, most often in the inner ear. About 35% of adults over 40 in the U.S. have experienced some form of vestibular dysfunction, and the likelihood increases with age, reaching up to 50% in people over 85. While vertigo feels like you or the room is spinning, it’s not a condition itself. It’s a symptom with a traceable source, and that source determines how long it lasts, how serious it is, and what to do about it.
How Your Balance System Works
Your inner ear contains a set of structures collectively called the vestibular system. Three tiny, fluid-filled tubes called semicircular canals detect rotational head movements. One senses up-and-down motion like nodding yes, another tracks left-to-right motion like shaking your head no, and the third picks up tilting movements toward either shoulder. Two additional chambers, the utricle and saccule, detect linear motion: the utricle senses forward and backward movement (like riding in a car), while the saccule detects vertical movement (like riding in an elevator).
Your brain constantly combines signals from these structures with input from your eyes and the position sensors in your muscles and joints. When any part of this system sends conflicting or faulty signals, the result is vertigo.
Displaced Crystals in the Inner Ear (BPPV)
Benign paroxysmal positional vertigo, or BPPV, is the single most common cause of vertigo. Tiny calcium carbonate crystals called otoconia normally sit in the utricle, where they help detect gravity. Sometimes these crystals break loose and drift into one of the semicircular canals, where they don’t belong. Once there, they slosh around with head movements and send exaggerated motion signals to the brain.
BPPV episodes are brief, typically lasting seconds to about a minute, and are triggered by specific head positions: rolling over in bed, looking up, or bending forward. The spinning can be intense but passes quickly once you hold still. This type of vertigo tends to come in clusters over days or weeks, then resolve on its own or with a simple head-repositioning maneuver performed in a doctor’s office.
Inflammation of the Inner Ear or Nerve
Two inflammatory conditions cause prolonged, severe vertigo that can last days to weeks. Vestibular neuritis is inflammation of the vestibular nerve, which connects the inner ear’s balance organs to the brain. Labyrinthitis is inflammation of the inner ear itself. Both produce intense, continuous spinning along with nausea, vomiting, and difficulty keeping your balance.
The key difference between them is hearing. Vestibular neuritis leaves hearing intact because only the balance nerve is affected. Labyrinthitis can cause hearing loss or ringing in the ear (tinnitus) because the inflammation also reaches the cochlea, the part of the inner ear responsible for hearing. That hearing loss is often permanent. Both conditions are usually triggered by a viral infection and improve gradually, though full recovery of balance function varies from person to person.
Ménière’s Disease and Fluid Pressure
Ménière’s disease causes vertigo through a buildup of fluid pressure inside the inner ear. The inner ear contains two separate fluids, each with a different chemical composition, separated by thin membranes lined with nerve cells. When pressure rises in the inner compartment, it stresses and eventually ruptures those membranes. The two fluids mix, and the resulting chemical change overwhelms the vestibular nerve receptors, essentially short-circuiting them. This creates a sudden imbalance in nerve signals that the brain interprets as violent spinning.
Ménière’s attacks are episodic and unpredictable, typically lasting anywhere from 20 minutes to several hours. They come with a distinctive cluster of symptoms: vertigo, fluctuating hearing loss, tinnitus, and a feeling of fullness or pressure in the affected ear. Over time, repeated episodes can lead to progressive hearing loss as the delicate structures of the inner ear sustain cumulative damage.
Vestibular Migraine
Migraine can produce vertigo even without a headache. Vestibular migraine is one of the more common yet underrecognized causes of recurrent vertigo, and it’s diagnosed when a person with a history of migraine experiences at least five episodes of moderate to severe vestibular symptoms lasting between 5 minutes and 72 hours. At least half of those episodes need to be accompanied by migraine features like one-sided pulsing head pain, sensitivity to light and sound, or visual aura.
The wide range in episode duration, from minutes to three days, makes vestibular migraine easy to confuse with other conditions. Some people have brief spinning spells that resemble BPPV, while others experience prolonged dizziness more like vestibular neuritis. The connection to migraine history is what ties it together.
Medications That Damage the Inner Ear
Over 200 medications are considered potentially ototoxic, meaning they can damage the sensory cells inside the inner ear that handle both hearing and balance. The most well-known culprits are a class of antibiotics called aminoglycosides, used for serious bacterial infections, and certain chemotherapy drugs. Some loop diuretics (used for fluid retention and high blood pressure) also carry this risk.
Less common offenders include quinine, used to treat malaria, and high doses of aspirin. The damage can cause persistent dizziness or vertigo that develops gradually during treatment and may not fully reverse after stopping the medication.
When Vertigo Comes From the Brain
Most vertigo originates in the inner ear (peripheral vertigo), but a small percentage comes from the brain itself (central vertigo), and this distinction matters because central causes can be life-threatening. A stroke affecting the brainstem or cerebellum can present as sudden vertigo, and it’s sometimes the only obvious symptom.
The warning signs that vertigo may have a central, brain-based cause include any additional neurological symptoms: difficulty speaking, facial or limb weakness, double vision, numbness on one side of the body, or new severe headache alongside dizziness. Vertigo combined with headache should specifically raise concern about a vertebral artery dissection, a tear in one of the arteries supplying the back of the brain. These combinations require emergency evaluation.
Doctors can distinguish peripheral from central vertigo at the bedside using a set of eye and head movement tests. In peripheral vertigo, the eyes drift in one consistent direction when the head is turned quickly. In central vertigo, the eye movements change direction depending on where the person looks, and the eyes may be vertically misaligned. These subtle differences can point toward a stroke even when brain imaging hasn’t been done yet.
Chronic Dizziness After Vertigo Resolves
Some people develop a lingering sense of unsteadiness or dizziness that persists long after the original vertigo-causing event has healed. This is called persistent postural-perceptual dizziness, or PPPD, and it represents the brain’s failure to recalibrate after a vestibular disturbance. It’s not imagined, but it is driven by the nervous system rather than ongoing inner ear damage.
PPPD is diagnosed when dizziness or unsteadiness (not spinning) occurs most days for at least three months, worsens with standing, moving, or processing heavy visual input like scrolling on a phone or walking through a busy store, and no other condition explains it. Common initial triggers include BPPV, vestibular neuritis, vestibular migraine, concussion, and even panic attacks. Once established, the condition can be self-reinforcing: anxiety about dizziness increases nervous system sensitivity, which worsens the dizziness. Treatment typically involves vestibular rehabilitation therapy, sometimes combined with medication or cognitive behavioral approaches to break the cycle.
How Episode Length Points to the Cause
One of the most useful clues in figuring out where vertigo is coming from is how long each episode lasts. BPPV produces the shortest episodes, usually under a minute, triggered by head position changes. Vestibular migraine episodes range from minutes to days. Ménière’s disease attacks typically last 20 minutes to several hours. Vestibular neuritis and labyrinthitis cause the longest episodes, with continuous vertigo lasting days to weeks that gradually fades. If your vertigo is constant and never lets up, that pattern points toward an inflammatory or central cause rather than BPPV or Ménière’s.