Vertigo happens when your brain receives conflicting signals about where your body is in space. Your balance system relies on three inputs working together: tiny fluid-filled organs in your inner ear, your eyes, and sensors in your muscles and joints. When any of these inputs sends faulty information, or when your brain can’t properly process the signals, you experience that unmistakable sensation of spinning or tilting even though you’re perfectly still. The causes range from loose crystals in your inner ear to viral infections, neck problems, medications, and occasionally something more serious in the brain.
How Your Balance System Works
Deep inside each ear sits a set of structures called the vestibular labyrinth. These chambers are filled with fluid and lined with microscopic hair cells that act as motion sensors. When you turn your head, the fluid shifts, bending those hair cells. They convert that movement into electrical signals that travel along the vestibular nerve to your brain.
Your brain cross-references those signals with what your eyes see and what your muscles and joints feel. When all three sources agree, you feel steady. When they conflict, you feel dizzy. Most causes of vertigo trace back to something going wrong with the inner ear sensors, the nerve carrying their signals, or the brain regions that interpret them.
Loose Crystals in the Inner Ear (BPPV)
The single most common cause of vertigo is a condition called benign paroxysmal positional vertigo, or BPPV. Inside the inner ear, tiny calcium carbonate crystals help you sense gravity. Sometimes these crystals break free and drift into one of the semicircular canals, the curved tubes that detect head rotation. The posterior canal is the most frequent destination because it sits at the lowest point relative to gravity.
Once the crystals are in the wrong place, certain head movements cause them to tumble through the canal fluid, dragging the fluid along with them. This tricks the hair cells into firing, sending a false “you’re spinning” message to your brain. The result is a brief but intense burst of vertigo, usually lasting less than a minute, triggered by specific positions: looking up, rolling over in bed, lying down, or sitting up from a lying position.
BPPV can happen after a head injury, but it often shows up without any obvious cause, especially in people over 50. Vitamin D deficiency has been linked to recurrent episodes, and supplementing can help if your levels are low.
Inner Ear Fluid Buildup (Ménière’s Disease)
Ménière’s disease produces longer, more intense vertigo episodes that can last 20 minutes to several hours. The underlying problem is excess fluid pressure inside the inner ear. The hearing and balance organs are separated by thin, nerve-rich membranes. When fluid pressure rises, those membranes stretch and distort, disrupting both balance and hearing signals at once.
This is why Ménière’s produces a distinctive cluster of four symptoms: spinning vertigo, fluctuating hearing loss, a low-pitched ringing or roaring in the ear, and a feeling of fullness or pressure in the affected ear. Episodes come and go unpredictably, though certain factors can provoke them. High sodium intake is a well-known trigger because salt affects fluid retention. The American Heart Association recommends no more than 2,300 milligrams of sodium per day, with 1,500 milligrams being the ideal target, but the average American diet contains roughly 3,400 milligrams. Spacing sodium evenly throughout the day, rather than consuming large amounts at one meal, can also help.
Viral Infections and Nerve Inflammation
A viral infection can inflame the vestibular nerve, the cable connecting your inner ear’s balance sensors to your brain. This is called vestibular neuritis, and it typically strikes suddenly with severe, constant vertigo that lasts hours to days. Unlike BPPV, the spinning doesn’t come and go with head position. It’s relentless at first, then gradually fades over weeks to months as your brain learns to compensate for the damaged nerve.
When the infection also affects the hearing portion of the inner ear, the condition is called labyrinthitis. It looks the same as vestibular neuritis but adds hearing loss or ringing in the affected ear. Bacterial infections of the middle ear can also spread to the inner ear and cause labyrinthitis, though viral infections are far more common. Recovery timelines vary. The acute spinning usually resolves within days, but a lingering sense of imbalance can persist for weeks or months.
Neck Problems and Cervical Vertigo
Your neck is packed with sensors that help your brain track your head’s position. When the cervical spine is inflamed, arthritic, or injured, those sensors can send garbled signals. The result is a dizziness that worsens when you move your head or hold the same posture for too long. This is sometimes called cervicogenic dizziness.
Vestibular rehabilitation, a type of physical therapy, can retrain your balance system to adapt to changes in your neck. The exercises focus on syncing your eye movements with your head movements so you feel steady when turning or looking around.
Medications That Cause Vertigo
A surprisingly long list of common medications can trigger vertigo as a side effect. Some are directly toxic to the inner ear. Others affect blood pressure, fluid balance, or brain chemistry in ways that produce dizziness. Drug classes that frequently cause vertigo include:
- Certain antibiotics, particularly aminoglycosides and some macrolides
- Anti-seizure medications
- Blood pressure drugs, including some calcium channel blockers, water pills, and alpha-blockers
- Anti-inflammatory drugs, including some prescription pain relievers and corticosteroids
- Acid reflux medications like omeprazole and lansoprazole
- Psychiatric medications, including lithium, some antipsychotics, and benzodiazepines
If vertigo started or worsened after beginning a new medication, that connection is worth exploring with whoever prescribed it.
Migraines, Stress, and Lifestyle Triggers
Migraines can cause vertigo even without a headache. Vestibular migraine is one of the most common causes of recurring vertigo, and its triggers overlap heavily with those for regular migraines: skipped meals, poor sleep, dehydration, and stress. These factors interact with each other in a cycle. Poor sleep makes headaches worse, which makes dizziness worse, which increases stress, which makes sleep harder.
Dehydration alone can make you dizzy by reducing blood volume and affecting how well your inner ear functions. Consistent hydration, regular meals, adequate sleep, and some form of exercise form a practical foundation for reducing episodes. Stress-reduction techniques that slow your breathing and heart rate, like extended exhales, can blunt the anxiety that often accompanies and worsens vertigo.
When Vertigo Signals Something Serious
Most vertigo comes from the inner ear and, while miserable, is not dangerous. But vertigo originating in the brain, from a stroke or other neurological problem, requires immediate attention. Doctors distinguish the two by observing eye movements and other neurological signs. In inner ear vertigo, the eyes drift in one consistent direction. In brain-related vertigo, eye movements change direction or other neurological symptoms appear.
Seek emergency care if vertigo arrives alongside any of these: a sudden severe headache, double vision or sudden hearing changes, numbness or weakness in your face, arms, or legs, trouble walking or stumbling, slurred speech or confusion, chest pain, a rapid or irregular heartbeat, or ongoing vomiting that won’t stop. These combinations suggest the brain rather than the ear is involved, and time matters.