Vertigo and dizziness affect roughly 1 in 5 adults, with population studies finding an overall prevalence around 21.6%. The causes range from tiny calcium crystals shifting inside your inner ear to medication side effects to, rarely, stroke. Most cases trace back to a problem in the inner ear’s balance system, but the specific cause determines how long episodes last, how they feel, and what helps.
How Your Balance System Works
Your sense of balance depends on three systems working together: your inner ear (which detects head movement and gravity), your eyes, and sensors in your neck and joints that tell your brain where your body is in space. Your brain constantly cross-references signals from all three. When any one of these systems sends faulty information, or when your brain can’t reconcile the signals, you feel dizzy or experience the spinning sensation of true vertigo.
The inner ear contains fluid-filled tubes called semicircular canals. When you move your head, the fluid shifts, bending tiny hair cells that send electrical signals to your brain. It also contains two structures that detect gravity using small calcium crystals resting on a membrane. Most causes of vertigo involve something going wrong in this delicate system.
BPPV: The Most Common Cause
Benign paroxysmal positional vertigo, or BPPV, is the single most common cause of vertigo. It has a lifetime prevalence of about 2.4% and accounts for a large share of vertigo cases seen in clinics. The problem is mechanical: tiny calcium crystals that normally sit in one part of your inner ear break loose and drift into the semicircular canals, where they don’t belong. These displaced crystals slosh around when you change head position, sending false movement signals to your brain.
The crystals typically detach due to age-related degeneration of the membrane they sit on. Head trauma, prolonged bed rest, and ear infections can also trigger it. The hallmark of BPPV is brief, intense spinning triggered by specific head movements: rolling over in bed, looking up, or bending forward. Episodes usually last less than a minute. Between episodes, you may feel fine or have mild unsteadiness.
BPPV is one of the most treatable forms of vertigo. A series of guided head movements (repositioning maneuvers performed in a doctor’s office) can move the crystals back where they belong, often resolving symptoms in one or two sessions.
Vestibular Neuritis and Labyrinthitis
Vestibular neuritis is an inflammation of the nerve that carries balance signals from your inner ear to your brain. It typically follows a viral infection. About 43% to 46% of cases are linked to a preceding or concurrent upper respiratory infection, with herpes simplex virus type 1 being the most common culprit. Other implicated viruses include influenza, adenovirus, and Epstein-Barr virus.
Unlike BPPV’s brief bursts of spinning, vestibular neuritis hits hard and lasts. You experience severe, constant vertigo that peaks in the first day or two, then gradually improves over weeks. By three months, most of the obvious symptoms have resolved. However, more than 30% of people still show subtle balance abnormalities on clinical testing a year later, which can show up as mild unsteadiness during quick head movements.
Labyrinthitis is closely related but involves inflammation of the inner ear structure itself rather than just the nerve. The key difference for you is that labyrinthitis causes hearing loss or ringing in the affected ear alongside the vertigo, while vestibular neuritis does not affect hearing.
Meniere’s Disease
Meniere’s disease produces recurring episodes of vertigo that last significantly longer than BPPV, typically between 20 minutes and 12 hours per episode. It’s caused by abnormal fluid buildup in the inner ear, though why this happens isn’t fully understood in most cases.
The condition is defined by a cluster of symptoms in one ear: vertigo episodes, fluctuating hearing loss (especially in lower-pitched sounds), ringing or roaring in the ear, and a sensation of fullness or pressure. These symptoms come and go unpredictably. Over time, hearing loss can become permanent. A formal diagnosis requires at least two spontaneous vertigo episodes lasting 20 minutes to 12 hours, documented hearing loss on a hearing test, and fluctuating ear symptoms, all in the same ear.
Vestibular Migraine
Migraine doesn’t just cause headaches. Vestibular migraine is now recognized as a distinct condition in which the same brain processes that trigger migraine pain also produce vertigo, sometimes with a headache and sometimes without one. This makes it tricky to identify, because people often don’t connect their dizziness to migraine.
Episodes can last anywhere from minutes to days. You may experience spinning vertigo, a rocking sensation, or general unsteadiness, often alongside light or sound sensitivity, visual aura, or a headache that has migraine characteristics (throbbing, one-sided, moderate to severe). People with a personal or family history of migraine are more likely to have this as the explanation for unexplained vertigo.
Neck-Related Dizziness
Your upper neck is packed with sensors that help your brain track head position. When those sensors send garbled signals, often due to neck injury, stiffness, or pain, the result can be dizziness. This is called cervicogenic dizziness.
The proposed mechanism is that disrupted signals from upper cervical spine sensors to the brain’s balance centers create a mismatch. Pain itself can also distort these signals. Cervicogenic dizziness often follows whiplash or develops alongside chronic neck problems. There’s no single definitive test for it. Instead, doctors rule out inner ear and brain causes first, then use specialized tests. One involves rotating the trunk while keeping the head still: if that trunk rotation alone provokes dizziness, the neck is implicated rather than the inner ear.
Medication Side Effects
Dizziness and vertigo are among the most common drug side effects, representing about 5% of all adverse reaction reports in pharmacovigilance data. Several broad drug categories are known offenders: blood pressure medications, anticonvulsants, antibiotics, antidepressants, antipsychotics, and anti-inflammatory drugs.
The dizziness these medications cause isn’t always true spinning vertigo. It can also feel like lightheadedness, unsteadiness, or a floating sensation. Blood pressure medications, for instance, often cause dizziness by dropping your blood pressure too low when you stand up. Anticonvulsants can affect the brain’s balance processing centers directly. If your dizziness started or worsened after beginning a new medication, that timing is an important clue worth discussing with your prescriber.
Persistent Postural-Perceptual Dizziness
Some people develop chronic dizziness that doesn’t fit neatly into any of the categories above. Persistent postural-perceptual dizziness (PPPD) is a condition where dizziness, unsteadiness, or a non-spinning sense of vertigo is present on most days for three months or more. Symptoms get worse when you’re standing upright, during movement (even passive movement like riding in a car), and in visually busy environments like grocery stores or scrolling screens.
PPPD often begins after an initial vertigo-causing event, like BPPV or vestibular neuritis, that has technically resolved. The original problem heals, but your brain’s threat-detection systems remain on high alert, continuing to generate dizziness in response to normal sensory input. Treatment typically involves vestibular rehabilitation therapy and sometimes medications that calm the brain’s overactive threat response.
When Vertigo Signals Something Serious
The vast majority of vertigo comes from inner ear problems that are uncomfortable but not dangerous. Rarely, vertigo is the primary symptom of a stroke affecting the back of the brain (posterior circulation stroke). This is easy to miss because, unlike the classic stroke presentation of facial drooping and arm weakness, a posterior circulation stroke can look like a simple inner ear problem.
Emergency physicians use a bedside exam called HINTS to distinguish the two. Three signs suggest stroke rather than an inner ear cause: the eyes track normally during quick head turns (counterintuitively, a “normal” result here is the worrying one), the direction of involuntary eye movements changes when looking in different directions, and the eyes are vertically misaligned when one is covered and uncovered.
For you, the practical red flags to watch for are vertigo combined with new difficulty walking or coordinating movements, double vision, slurred speech, severe headache, numbness or weakness on one side of the body, or difficulty swallowing. Any of these alongside vertigo warrant emergency evaluation. Vertigo from central (brain) causes also tends to produce less intense spinning but more trouble with balance and coordination compared to inner ear vertigo, which typically causes severe spinning but allows you to at least sit upright.
Peripheral vs. Central Causes
Doctors broadly sort vertigo into peripheral (inner ear) and central (brain) categories because the distinction shapes everything about the workup and urgency. Peripheral causes, including BPPV, vestibular neuritis, labyrinthitis, and Meniere’s disease, account for the large majority of cases. They tend to produce intense spinning, often with nausea, and are frequently triggered or worsened by head movement. Hearing changes, if present, point strongly to an inner ear origin.
Central causes include stroke, multiple sclerosis, tumors, and vestibular migraine. The duration of episodes provides a useful clue: vertigo from reduced blood flow to the brainstem typically lasts minutes, while inner ear causes of recurrent vertigo typically last hours. Central causes also tend to produce purely vertical eye movements (eyes beating straight up or straight down) rather than the horizontal or rotary eye movements seen with inner ear problems. Accompanying neurological symptoms like limb weakness, facial numbness, or vision changes are the clearest indicators that the cause is central rather than peripheral.