Vertigo has many possible causes, but the vast majority trace back to a problem in the inner ear. Between 10% and 36% of adults experience dizziness or vertigo at some point, and women are affected more often than men. Before diving into specific causes, it helps to clarify what vertigo actually is: a false sensation that you or your surroundings are spinning or moving. It’s distinct from general lightheadedness or feeling woozy, which can stem from a wider range of issues.
Displaced Crystals in the Inner Ear (BPPV)
The single most common cause of vertigo is benign paroxysmal positional vertigo, or BPPV. Inside your inner ear, tiny calcium crystals called otoconia normally sit on a sensory organ that helps detect gravity and linear movement. Sometimes these crystals break loose and drift into the semicircular canals, the fluid-filled tubes your brain relies on to sense head rotation. When the loose crystals shift with movement, they drag the fluid along with them, sending false rotation signals to your brain.
BPPV episodes are brief, usually lasting less than a minute, and triggered by specific head movements: rolling over in bed, looking up, or bending forward. The spinning sensation can be intense and often comes with nausea. Without treatment, symptoms typically fade over days to weeks, though in rare cases they persist for years. The good news is that BPPV responds well to simple repositioning maneuvers performed in a clinic, which guide the crystals back where they belong.
To diagnose BPPV, a clinician will typically perform a test where you sit on an exam table, your head is turned 45 degrees to one side, and you’re quickly lowered onto your back so your head hangs slightly off the edge. If the displaced crystals trigger abnormal eye movements called nystagmus, the diagnosis is confirmed. The test takes only a few moments per side.
Vestibular Neuritis and Labyrinthitis
When a viral infection inflames the vestibular nerve, the nerve that carries balance signals from the inner ear to the brain, the result is vestibular neuritis. It typically causes a single, severe episode of vertigo lasting days, often accompanied by nausea and difficulty walking. The key distinction: vestibular neuritis does not affect hearing.
Labyrinthitis involves inflammation of a deeper structure called the labyrinth, which handles both balance and hearing. Because of that, labyrinthitis causes vertigo along with hearing loss or ringing in the ear. If your vertigo comes with noticeable changes in hearing, that points toward labyrinthitis rather than neuritis. Both conditions usually resolve over weeks, though some people experience lingering imbalance for months.
Ménière’s Disease
Ménière’s disease produces recurring episodes of vertigo that last anywhere from 20 minutes to several hours. It’s caused by a buildup of excess fluid in the inner ear, a condition called endolymphatic hydrops, where the membranes inside the ear become distended from rising fluid pressure. The episodes come with a recognizable cluster of symptoms: fluctuating hearing loss, ringing or roaring in the affected ear, and a feeling of fullness or pressure, as if the ear is stuffed.
Unlike BPPV, Ménière’s episodes are unpredictable and can vary in frequency from several times a week to months apart. Over time, hearing loss in the affected ear may become permanent. Treatment focuses on reducing the frequency and severity of attacks, often through dietary changes like limiting salt intake, along with medications and vestibular rehabilitation.
Vestibular Migraine
Migraine doesn’t always mean a headache. Vestibular migraine causes moderate to severe vertigo episodes that can last anywhere from five minutes to 72 hours. At least half of the episodes occur alongside typical migraine features: one-sided pulsating head pain, sensitivity to light and sound, or visual aura. But some episodes involve vertigo with no headache at all, which makes this diagnosis easy to miss.
Among migraine patients studied in a large clinical sample, 68% reported at least one episode of vestibular symptoms, and women were significantly more likely to be affected. A history of migraine with or without aura is a prerequisite for the diagnosis. If you’ve had migraines in the past and now experience unexplained vertigo episodes, the two may be connected.
Neck Problems
Your cervical spine plays a direct role in balance and coordination. When the neck is inflamed, injured, or arthritic, it can produce dizziness and unsteadiness sometimes called cervicogenic dizziness. The exact mechanism is still being studied, but the leading theory involves disrupted signals from the neck’s position sensors, which normally help the brain track where your head is in space.
Common triggers include whiplash injuries, cervical arthritis (cervical spondylosis), herniated discs, and chronic muscle strain. The vertigo tends to worsen with neck movement and may be accompanied by neck pain or stiffness. Vestibular rehabilitation, a set of exercises designed to retrain the balance system to compensate for faulty neck signals, is the primary treatment approach.
Medications That Damage the Inner Ear
Certain medications are directly toxic to the structures of the inner ear, and vertigo or balance problems can be a side effect. The most well-known culprits are a class of antibiotics called aminoglycosides. Streptomycin, for example, damages the vestibular portion of the inner ear more than the hearing portion, causing vertigo and balance difficulties that are usually temporary but can sometimes become permanent. Gentamicin carries similar risks.
Other drug classes with inner ear toxicity include:
- Certain IV diuretics, particularly when combined with aminoglycoside antibiotics in patients with kidney problems
- Platinum-based chemotherapy drugs, which can cause tinnitus and hearing loss
- High-dose aspirin (around 2 grams daily), which typically causes reversible hearing changes and ringing
- Quinine and related compounds, which can cause temporary hearing loss
If you develop vertigo, hearing changes, or persistent ringing after starting a new medication, that timing is worth noting and discussing with the prescribing clinician.
Vitamin Deficiencies
Nutritional shortfalls can contribute to vertigo in ways that are easy to overlook. Iron deficiency anemia, vitamin B12 deficiency, and vitamin D deficiency have all been linked to vestibular dysfunction. B12 deficiency is especially common in older adults and can impair nerve function throughout the body, including the nerves responsible for balance. If vertigo is accompanied by fatigue, numbness, or tingling in the hands and feet, a B12 deficiency is worth investigating through a simple blood test.
When Vertigo Signals Something Serious
Most vertigo is caused by inner ear problems that, while disruptive, aren’t dangerous. But vertigo can occasionally signal a stroke affecting the brain’s balance centers, and distinguishing the two matters enormously. In an emergency setting, clinicians use a bedside evaluation that checks three things: how the eyes respond to rapid head turns, whether involuntary eye movements change direction when looking in different directions, and whether the eyes are vertically misaligned.
In typical inner ear vertigo, rapid head turns produce a visible corrective eye jerk, the involuntary eye movements beat in a consistent direction, and the eyes stay vertically aligned. When any of those findings flip (no corrective eye jerk, direction-changing eye movements, or vertical misalignment), the concern for a central cause like stroke rises significantly. Vertigo accompanied by new difficulty speaking, swallowing, or using one side of the body always warrants emergency evaluation.
Other Contributing Factors
Several systemic conditions can produce or worsen vertigo without directly involving the inner ear. High blood pressure can affect blood flow to the vestibular system. Thyroid disorders, both overactive and underactive, have been associated with balance disturbances. Anxiety disorders frequently coexist with vertigo and can amplify the sensation or trigger episodes independently, creating a cycle where dizziness fuels anxiety and anxiety fuels dizziness.
Low blood sugar, dehydration, and sudden drops in blood pressure when standing (orthostatic hypotension) are common culprits behind the broader category of dizziness, though they tend to produce lightheadedness rather than true spinning vertigo. The distinction matters because the causes and treatments differ. If you consistently feel the room rotating around you, the inner ear and neurological causes covered above are the most likely explanations.