Vertigo is most often caused by problems in the inner ear, where your body’s balance system lives. The single most common cause is a condition called BPPV, where tiny crystals inside the ear shift out of place. But vertigo can also stem from infections, migraines, nerve damage, and less commonly, problems in the brain itself. Understanding the different causes helps you recognize what type you might be dealing with and what to expect.
BPPV: The Most Common Cause
Benign paroxysmal positional vertigo, or BPPV, accounts for more cases of vertigo than any other single condition. It has a lifetime prevalence of about 2.4% and affects roughly 107 out of every 100,000 people each year. The spinning sensation hits suddenly when you change the position of your head: rolling over in bed, looking up at a shelf, or tilting your head back in the shower.
The mechanism is surprisingly physical. Your inner ear contains tiny calcium crystals that help you sense gravity and movement. In BPPV, some of these crystals break loose and drift into one of the semicircular canals, the fluid-filled tubes that detect rotation. When you move your head, the loose crystals shift through the fluid and send false motion signals to your brain. Each episode of spinning is brief, usually lasting less than a minute, but it can be intense and disorienting.
BPPV becomes more common with age and is more frequent in women. Head injuries, prolonged bed rest, and ear surgery can all trigger it. In many cases, though, there’s no obvious cause. The good news is that a simple repositioning maneuver performed by a clinician (or sometimes at home) can guide the crystals back where they belong, often resolving symptoms in one or two sessions.
Inner Ear Infections and Inflammation
Viral infections can inflame the structures of the inner ear and produce vertigo that lasts days to weeks rather than seconds. Two conditions fall into this category, and the key difference between them is hearing.
Vestibular neuritis involves inflammation of the nerve that carries balance signals from your inner ear to your brain. It causes severe, constant vertigo, nausea, and difficulty walking, but your hearing stays normal. Labyrinthitis affects both the balance nerve and the hearing structures of the inner ear, so it causes the same intense vertigo plus hearing loss or ringing in the ear. Both conditions typically follow a viral illness, and the worst symptoms usually improve within a few days, though a lingering sense of unsteadiness can persist for weeks or months as the brain recalibrates.
Ménière’s Disease
Ménière’s disease produces recurring episodes of vertigo that last anywhere from 20 minutes to 12 hours, sometimes up to 24 hours. A diagnosis requires at least two such episodes along with documented hearing loss on a hearing test and either tinnitus (ringing in the ear) or a sensation of fullness or pressure in the affected ear.
The underlying problem involves excess fluid buildup in the inner ear. A structure called the endolymphatic sac normally regulates inner ear fluid levels, and when that regulation fails, the increased pressure disrupts both balance and hearing signals. The condition typically affects one ear and tends to come in unpredictable flare-ups. Over time, hearing loss can become permanent. Treatment often focuses on reducing fluid retention and managing episodes when they occur.
Vestibular Migraine
Migraine doesn’t just cause headaches. Vestibular migraine is now recognized as a distinct condition where the primary symptom is vertigo or dizziness rather than head pain. According to the International Classification of Headache Disorders, vestibular migraine involves moderate to severe vestibular symptoms lasting between 5 minutes and 72 hours, though the duration varies enormously from person to person.
About 30% of people with vestibular migraine have episodes lasting minutes, 30% have attacks lasting hours, and another 30% experience episodes stretching over several days. A small percentage have attacks lasting only seconds but recurring repeatedly with head motion or visual stimulation. Some people take up to four weeks to fully recover from a single episode. A current or past history of migraine (with or without aura) is part of the diagnostic picture, so if you’ve had migraines before and now experience unexplained dizziness, this is worth exploring.
Medications That Damage the Inner Ear
More than 200 medications are considered potentially ototoxic, meaning they can damage the delicate structures of the inner ear responsible for hearing and balance. The damage can cause vertigo, hearing loss, tinnitus, or a combination of all three.
The most commonly recognized culprits include:
- Certain antibiotics used for serious bacterial infections (the aminoglycoside class, including gentamicin and tobramycin)
- Chemotherapy drugs, particularly platinum-based agents used in cancer treatment
- Loop diuretics (water pills) prescribed for heart failure or high blood pressure
- High-dose aspirin, which can cause reversible balance and hearing changes
- Antimalarial drugs containing quinine
The risk depends on the dose, duration of use, and individual factors like kidney function. If you develop dizziness while taking any medication, it’s worth flagging with whoever prescribed it, since the effects are sometimes reversible if caught early.
Brain and Nervous System Causes
Vertigo caused by the brain rather than the inner ear is less common but more serious. Strokes affecting the brainstem or cerebellum (the brain region that coordinates balance) can produce sudden vertigo, and this is the scenario that emergency physicians are most vigilant about ruling out.
Several features distinguish central vertigo from the more common inner ear variety. In peripheral (inner ear) vertigo, eye movements called nystagmus beat in one direction consistently. In central vertigo, the direction of those eye movements can change depending on where you look. Another clue: in inner ear vertigo, the brain struggles to keep your eyes locked on a target when your head is turned quickly, producing a visible corrective eye movement. In central vertigo, that corrective movement is typically absent. Misalignment between the two eyes (one sitting higher than the other) also points toward a brainstem problem.
Other central causes include multiple sclerosis, tumors near the brainstem, and acoustic neuromas (slow-growing growths on the nerve connecting the inner ear to the brain). These conditions usually produce additional neurological symptoms like double vision, slurred speech, limb weakness, or difficulty swallowing.
Less Common Structural Causes
Superior canal dehiscence syndrome occurs when there’s a small opening in the bone covering one of the semicircular canals. This gap creates an extra pathway for sound and pressure waves to reach the balance organ, triggering dizziness in unusual situations. Sneezing, coughing, straining, or hearing loud noises can all provoke vertigo because they create pressure changes that travel through the opening.
The cause of the bony defect isn’t entirely clear. Some research from Johns Hopkins suggests it may be present from birth, since the superior semicircular canal is the last part of the inner ear bone to fully develop in a fetus. In other cases, gradual thinning of the bone over years, possibly from the pulsing of brain tissue against it, eventually creates the opening. Symptoms sometimes appear suddenly after a head injury or any event that sends a pressure wave through the skull. The condition doesn’t typically worsen over time, but the triggers remain consistent.
Perilymph fistula is a related condition where a tear in the thin membrane separating the middle and inner ear allows fluid to leak. Head trauma, rapid pressure changes (as in diving or flying), and heavy straining are common triggers. Symptoms overlap with SCDS: dizziness provoked by pressure changes, loud sounds, or physical effort.
Other Contributing Factors
Not all vertigo fits neatly into a single diagnosis. Low blood pressure, especially when standing up quickly, can produce lightheadedness that people describe as vertigo. Anxiety and panic disorders can generate a sensation of spinning or unsteadiness that’s real and distressing even when the inner ear is functioning normally. Neck problems, particularly after whiplash injuries, occasionally contribute to dizziness through disrupted signals from the joints and muscles of the upper spine.
Age itself is a factor. The balance system relies on input from your inner ear, your vision, and sensors in your joints and muscles. As these systems gradually decline, the brain has less reliable information to work with, making older adults more susceptible to vertigo from causes that might not affect a younger person. Diabetes and cardiovascular disease can further compromise blood flow to the inner ear, adding another layer of risk.