Vertigo is the sensation that you or the room around you is spinning, even though nothing is actually moving. It’s different from general dizziness, which feels more like lightheadedness or being off-balance. Vertigo is specifically a false sense of motion, and it stems from a problem in the system your body uses to track where you are in space.
How Your Balance System Creates Vertigo
Deep inside each ear, a network of fluid-filled tubes and chambers called the vestibular system acts as your body’s internal gyroscope. These structures contain fluid and microscopic hair cells. When you move your head, the fluid shifts and bends the hair cells, which send signals to your brain about your position and speed. Your brain combines those signals with input from your eyes and joints to keep you oriented.
Vertigo happens when something disrupts this process. The signals from one ear stop matching the signals from the other, or they conflict with what your eyes are seeing. Your brain interprets this mismatch as motion, even though you’re standing still. That’s what creates the spinning sensation, and it’s also why vertigo often triggers nausea. Your brain is essentially reacting the same way it would to motion sickness.
The Most Common Cause: Loose Crystals
The single most common cause of vertigo is a condition called BPPV (benign paroxysmal positional vertigo). Inside your inner ear, tiny calcium crystals normally sit in chambers where they help you sense gravity. Sometimes these crystals break loose and drift into the semicircular canals, the curved tubes that detect head rotation. Once there, they slosh around with the fluid and send false movement signals every time you change head position.
BPPV episodes are brief but intense. Rolling over in bed, tilting your head back in the shower, or looking up at a shelf can trigger a burst of spinning that lasts anywhere from a few seconds to about a minute. The vertigo stops when the crystals settle, then returns with the next triggering movement. It’s not dangerous, but it can be disorienting enough to cause falls.
The good news is that BPPV responds well to a simple, non-invasive treatment called the Epley maneuver. A clinician guides your head through a specific sequence of positions that moves the loose crystals out of the semicircular canal and back to where they belong. It works in about 8 out of 10 people, often in just one or two sessions.
Other Inner Ear Causes
Ménière’s disease is another well-known cause. It involves a buildup of excess fluid pressure in the inner ear, and it produces a distinctive combination of symptoms: vertigo episodes lasting 20 minutes to several hours, hearing loss (confirmed by testing), and ringing or fullness in the affected ear. The vertigo in Ménière’s tends to come in unpredictable attacks that can be severe enough to make standing impossible. Treatment focuses on reducing the fluid buildup, often with medications that help the body shed excess fluid.
Vestibular neuritis, an inflammation of the nerve that carries balance signals from the ear to the brain, causes sudden, intense vertigo that can last days. It’s usually triggered by a viral infection. Unlike BPPV, the spinning is constant rather than triggered by position changes, and it gradually improves as the inflammation resolves.
When Vertigo Signals Something Serious
Most vertigo comes from inner ear problems and resolves on its own or with treatment. But in a small number of cases, vertigo originates in the brain rather than the ear, sometimes from a stroke affecting the brain’s balance-processing areas. This is more concerning and harder to spot than you might expect. Focal neurological signs are absent in as many as 20% of posterior circulation strokes, meaning someone can have a stroke-related vertigo episode that looks, on the surface, just like an inner ear problem.
Symptoms that suggest a brain-based cause and warrant emergency evaluation include:
- New difficulty speaking or swallowing
- Weakness or numbness on one side of the body
- Severe trouble walking or coordinating movements
- Double vision
- A sudden, severe headache unlike any you’ve had before
In the emergency department, doctors use a bedside eye examination to help distinguish inner ear vertigo from brain-based vertigo. This involves checking how your eyes move during head turns, whether your eye-twitching changes direction when you look different ways, and whether your eyes are vertically misaligned. All three components must point to an inner ear cause before a brain-based cause can be ruled out.
How Vertigo Is Diagnosed
For suspected BPPV, the primary diagnostic test is straightforward. You sit on an exam table, and a clinician turns your head 45 degrees to one side, then quickly guides you from sitting to lying flat with your head hanging slightly over the edge. They watch your eyes for involuntary twitching movements. If your eyes twitch, it confirms loose crystals, and the direction of the twitching tells the clinician which ear is affected. The ear that’s closest to the floor when the twitching occurs is the one with displaced crystals.
For other causes, diagnosis may involve hearing tests, imaging, or longer observation of your symptoms over time. Ménière’s disease, for instance, requires documented episodes of vertigo along with measurable hearing loss before a diagnosis is made.
Treatment Beyond Repositioning
When vertigo isn’t caused by BPPV, or when symptoms need short-term relief, medications can help suppress the spinning sensation. Over-the-counter antihistamines like meclizine work by dampening the excitability of the inner ear’s balance structures. They’re most effective when used for two to three days during acute episodes rather than taken continuously. Anti-nausea medications can help manage the vomiting that often accompanies severe vertigo.
For some patients with intense acute episodes, doctors may prescribe short courses of anti-anxiety medications that calm the nervous system and reduce vertigo signals. These are used sparingly and discontinued quickly because long-term use can actually interfere with the brain’s natural ability to recalibrate and compensate for the balance disruption.
That compensation process is important. Over time, your brain learns to rely more on the healthy ear and on visual and joint signals to maintain balance. Vestibular rehabilitation, a form of physical therapy, accelerates this process through specific exercises that challenge and retrain your balance system. For conditions like vestibular neuritis, this rehab is often the most effective long-term treatment.
How Common Vertigo Is
Vertigo is remarkably common. In a study of nearly 3,000 adults across a wide age range, 48.3% reported experiencing vertigo at least once in the previous 12 months. It affects women more often than men and becomes more frequent with age, though it can occur at any point in life. Most episodes are short-lived and caused by benign conditions, but the experience can be frightening enough that many people assume something is seriously wrong the first time it happens.