Vertigo spells are most commonly caused by problems in the inner ear, where tiny structures control your sense of balance. About 3% of the U.S. adult population has a diagnosed vestibular disorder, and the single most frequent cause is a condition where small calcium crystals become dislodged inside the ear canal. But several other conditions, from fluid buildup to nerve inflammation to migraines, can also trigger episodes that range from seconds to days.
Displaced Crystals in the Inner Ear (BPPV)
Benign paroxysmal positional vertigo, or BPPV, is the leading cause of vertigo spells. Each inner ear contains three fluid-filled semicircular canals that detect head movement. Inside these canals, tiny hair cells sit beneath a gel-like cap that shifts when you turn your head, sending signals to the brain about your position in space. BPPV happens when small calcium carbonate crystals, which normally sit in a different part of the ear, break loose and drift into one of these canals.
Once those crystals are floating freely, they slosh around with every head movement and push on the hair cells inappropriately. Your brain receives a motion signal that doesn’t match what your eyes see, and the result is a sudden spinning sensation. The crystals most often come loose due to age-related wear on the inner ear lining, though head trauma, prolonged bed rest, and prior ear infections can also shake them free.
BPPV episodes are short and repetitive, typically lasting less than a minute each. They’re triggered by specific position changes: rolling over in bed, tilting your head back, or bending forward. The spinning stops once the displaced crystals settle, but it returns the next time you move into a triggering position. A diagnostic test called the Dix-Hallpike maneuver, where a clinician guides you through specific head positions while watching your eye movements, has about 79% sensitivity for detecting the most common form of BPPV. Treatment usually involves a series of guided head movements designed to roll the crystals back to where they belong.
Fluid Buildup in the Inner Ear (Meniere’s Disease)
Meniere’s disease causes vertigo through a different mechanism: excess fluid pressure inside the inner ear. The inner ear contains a fluid called endolymph, and normally the body maintains a careful balance between producing and reabsorbing it. In Meniere’s disease, that balance breaks down. Fluid accumulates and swells the membranes of both the hearing and balance organs, distorting the signals they send to the brain.
The hallmark of Meniere’s is vertigo episodes lasting minutes to hours, accompanied by a feeling of fullness or pressure in one ear, ringing (tinnitus), and fluctuating hearing loss. Over time, hearing loss can become permanent. The exact reason endolymph accumulates remains unclear, though it’s the most consistent finding in tissue studies of affected ears. Episodes tend to come in clusters, with stretches of weeks or months between flare-ups.
Inflammation of the Inner Ear or Balance Nerve
Two inflammatory conditions cause vertigo that lasts much longer than BPPV or Meniere’s, often persisting for several hours to days.
Vestibular neuritis is inflammation of the nerve that carries balance signals from the inner ear to the brain. It typically follows a viral infection and produces severe rotational vertigo, nausea, and difficulty standing, but hearing remains intact. The vertigo is constant rather than triggered by position changes, and the acute phase can last several days before gradually improving over weeks.
Labyrinthitis involves inflammation of the inner ear structures themselves, affecting both balance and hearing. It produces the same intense, sustained vertigo as vestibular neuritis but adds hearing loss and sometimes ringing in the affected ear. Both conditions usually resolve on their own, though full recovery of balance function can take weeks to months as the brain learns to compensate for the damaged signals.
Vestibular Migraines
Migraines can cause vertigo even without a headache. Vestibular migraine is now recognized as a distinct diagnosis, defined by at least five episodes of moderate to severe vestibular symptoms lasting anywhere from 5 minutes to 72 hours. “Moderate” means the vertigo interferes with daily activities; “severe” means you can’t continue them at all.
To qualify as vestibular migraine, at least half of the episodes need to occur alongside typical migraine features: one-sided or pulsating head pain, sensitivity to light and sound, or visual aura. But the vertigo itself takes several forms. It can be spontaneous (a false sensation of spinning or self-motion), positional (triggered by head position changes, similar to BPPV), visually induced (set off by busy or large moving visual scenes), or brought on by head motion with accompanying nausea. A current or past history of migraine is required for the diagnosis, and many people with vestibular migraine have had typical headache migraines for years before the vertigo episodes begin.
Head Trauma and Physical Injury
A blow to the head is one of the clearest triggers for vertigo spells, especially BPPV. The rapid deceleration or rotational forces during a head injury can physically shake calcium crystals loose from their normal position, even without a skull fracture. Direct trauma to the temporal bone (the bone surrounding the inner ear) can damage the semicircular canals or the organs that house those crystals.
Severe traumatic brain injury involving widespread nerve damage or significant bruising of the brain is more likely to cause lasting vestibular problems. Skull or cervical spine fractures carry additional risk, as fractures near the ear can directly disrupt inner ear structures, while neck fractures can interfere with the body’s position-sensing system. Post-traumatic BPPV is frequently seen in younger patients involved in sports collisions or motor vehicle accidents, reflecting who is most likely to sustain these injuries. Prolonged bed rest after a head injury can worsen the problem by limiting sensory input the brain needs to recalibrate balance.
Structural Defects in the Ear Bone
A less common but noteworthy cause is superior canal dehiscence syndrome, where the thin bone covering the top semicircular canal develops an opening or becomes too thin. Normally, sound energy entering the inner ear is contained between two “windows” in the bone. When a third opening exists at the top of the canal, sound and pressure get diverted into the balance system instead. This can cause vertigo triggered by loud sounds, straining, coughing, or anything that changes pressure in the ear. Some people with this condition hear their own eye movements or footsteps abnormally loudly. The opening may be present from birth but only becomes symptomatic later, possibly when the tissue covering the gap thins enough to transmit pressure.
Brain-Related Causes
All the causes above originate in the inner ear or its nerve connections, classified as “peripheral” vertigo. A smaller but more serious category is “central” vertigo, caused by problems in the brain itself, particularly the brainstem or cerebellum. Stroke, multiple sclerosis, and tumors can all produce vertigo by disrupting the brain’s ability to process balance signals.
Central vertigo looks and feels different from inner ear problems. People with brain-related vertigo more often describe a sense of imbalance and unsteadiness rather than true spinning. They frequently cannot stand or walk even with assistance, while people with inner ear vertigo can usually manage to stand with some help. Nausea and vomiting, which are common with peripheral vertigo, tend to be less prominent. One telling difference is eye movements: in peripheral vertigo, the involuntary eye jerking (nystagmus) goes in one direction and calms down when you focus on a fixed point. In central vertigo, the eye movements may change direction depending on where you look, can be purely up-and-down or rotational, and don’t improve with visual focus.
Age, Health Conditions, and Other Risk Factors
Aging is the single broadest risk factor for vertigo spells. The inner ear’s crystal-containing structures degenerate over time, making BPPV increasingly common in older adults. Age-related declines in blood flow, nerve function, and musculoskeletal health all compound the problem and make recovery slower when vertigo does occur.
Several chronic health conditions raise your risk. Diabetes, high blood pressure, and cardiovascular disease can impair blood supply to the inner ear or brain regions involved in balance. Osteoporosis has been linked to changes in the calcium metabolism that may affect the inner ear crystals. Anxiety, depression, and PTSD don’t directly cause vertigo but can heighten sensitivity to vestibular symptoms and amplify the perception of dizziness, creating a cycle where psychological distress and physical symptoms reinforce each other.
How Episode Duration Points to the Cause
The length of a single vertigo spell is one of the most useful clues to its origin. BPPV episodes last under a minute, triggered by specific head positions, and stop when you hold still. Meniere’s disease produces episodes lasting 20 minutes to several hours, with ear symptoms accompanying the vertigo. Vestibular migraine falls in a wide range of 5 minutes to 72 hours, usually with migraine features present. Vestibular neuritis and labyrinthitis cause continuous vertigo lasting hours to days, often following a viral illness. Central causes tend to produce persistent imbalance that doesn’t come and go in discrete spells the way inner ear conditions do.
Tracking what triggers your episodes, how long they last, and what other symptoms appear alongside the vertigo gives your doctor the clearest path to identifying the cause. A pattern of brief, position-triggered spells points in a very different diagnostic direction than hours-long episodes with hearing changes or days of constant spinning after a cold.