Vertigo flares up when something disrupts the balance signals your inner ear sends to your brain. The specific trigger depends on which type of vertigo you have, but common culprits include head movements, high salt intake, stress, dehydration, poor sleep, hormonal shifts, and certain medications. Understanding your particular type of vertigo is the key to identifying what sets it off.
Loose Crystals in the Inner Ear (BPPV)
The most common cause of vertigo flare-ups is benign paroxysmal positional vertigo, or BPPV. Your inner ear contains tiny calcium carbonate crystals called canaliths that normally sit in a structure called the utricle, where they help you sense gravity. Sometimes these crystals break loose and drift into the semicircular canals, the fluid-filled tubes that detect head rotation. Once they’re in the wrong place, certain head movements send false motion signals to your brain, and the room starts spinning.
BPPV episodes are brief, usually lasting less than 60 seconds, but they’re intense. They’re triggered by specific position changes: rolling over in bed, tilting your head back in the shower, bending down to tie your shoes, or looking up at a high shelf. The spinning stops once you hold still, but it returns the next time you move into that position. Head injuries, aging, and prolonged bed rest can all cause crystals to dislodge, though sometimes it happens for no identifiable reason.
A physical therapist or doctor can often fix BPPV in one or two visits using a series of guided head movements called the canalith repositioning procedure (sometimes called the Epley maneuver). This coaxes the loose crystals back where they belong. It works well for most people, though episodes can recur months or years later.
Fluid Buildup From Ménière’s Disease
Ménière’s disease causes vertigo episodes that last much longer, anywhere from 20 minutes to several hours. The underlying problem is excess fluid (endolymph) building up in the inner ear, which disrupts both balance and hearing signals. What causes the fluid to accumulate isn’t fully understood, but allergies, prior head injuries, ear infections, and migraines all appear to play a role.
Diet is one of the biggest controllable triggers. Salt causes the body to retain fluid, and that includes the inner ear. Doctors typically recommend keeping sodium below 1,500 milligrams per day, roughly three-quarters of a teaspoon of table salt. Foods containing MSG can also provoke episodes. Caffeine and alcohol are additional triggers worth reducing or eliminating if you notice a pattern.
Stress and sleep deprivation round out the list. Managing these is easier said than done, but people with Ménière’s often notice a clear connection between a stressful week and a vertigo attack that follows.
Vestibular Migraine
Migraine doesn’t just cause headaches. In some people, it primarily affects the balance system, producing vertigo episodes with or without head pain. This is called vestibular migraine, and it shares the same triggers as traditional migraines: disrupted sleep patterns, hormonal changes (especially around menstruation), and specific foods like aged cheese, chocolate, red wine, and MSG. Women are more affected than men, and symptoms often worsen around their period.
The tricky part is that vestibular migraine triggers are cumulative. You might tolerate one trigger fine on its own, like a glass of red wine, but combine it with poor sleep and you get a full episode. Keeping a symptom diary that tracks food, sleep, stress, and your menstrual cycle can help you spot the combinations that push you over the threshold.
Viral Infections and Nerve Inflammation
A sudden, severe vertigo episode that lasts days rather than minutes or hours often points to vestibular neuritis, an inflammation of the nerve connecting your inner ear to your brain. This is typically caused by a viral infection, either one that directly infects the inner ear or one circulating elsewhere in your body. The flu, COVID-19, herpes simplex (the cold sore virus), measles, and mumps have all been linked to vestibular neuritis.
Unlike BPPV or Ménière’s, vestibular neuritis usually hits once and then gradually improves over days to weeks as the inflammation subsides. Some people, however, are left with residual balance sensitivity that can flare during future illnesses or periods of fatigue.
How Stress Physically Triggers Vertigo
Stress isn’t just a vague “makes everything worse” factor. It has a specific mechanism. When you’re stressed, your body releases cortisol, which raises blood pressure. Elevated blood pressure directly affects the delicate structures of the inner ear and can disrupt normal vestibular function. Chronic stress keeps cortisol levels persistently high, which sensitizes the entire nervous system and lowers your threshold for vertigo triggers. In other words, long-term stress doesn’t just make individual episodes worse. It makes them happen more often.
This creates a feedback loop that’s worth understanding: vertigo causes anxiety, anxiety raises stress hormones, and those hormones make the vestibular system more reactive. Breaking the cycle with stress management, whether through exercise, therapy, or better sleep habits, can meaningfully reduce how often vertigo acts up.
Medications That Affect the Inner Ear
More than 200 medications can potentially damage the sensory cells in your inner ear that help you keep your balance. This is called ototoxicity, and it’s an overlooked cause of vertigo flare-ups. The most commonly implicated drug classes include certain antibiotics used for serious bacterial infections (aminoglycosides like gentamicin), some chemotherapy drugs, and certain diuretics (water pills) used for blood pressure or heart failure.
Even common over-the-counter medications can contribute. Aspirin and related compounds, taken in high doses over extended periods, are a recognized cause of balance disruption and ringing in the ears. If your vertigo started or worsened after beginning a new medication, that connection is worth investigating with your prescriber.
When Vertigo Signals Something Serious
Most vertigo comes from the inner ear and, while miserable, isn’t dangerous. But vertigo can occasionally be the first sign of a stroke affecting the back of the brain. What makes this particularly tricky is that isolated vertigo, with no other obvious neurological symptoms, is actually the most common warning sign before a stroke in the arteries supplying the brainstem and cerebellum. Fewer than 20% of these stroke patients show the classic signs like limb weakness or facial drooping.
The red flags that distinguish dangerous vertigo from the inner-ear variety include: sudden severe headache or neck pain accompanying the vertigo, inability to walk or stand, double vision, slurred speech, or numbness on one side of the body. Vertigo from the inner ear is typically provoked by specific head positions. Vertigo from a stroke tends to be constant and severe regardless of position. If your vertigo came on suddenly, is unrelenting, and feels different from any previous episode, that warrants emergency evaluation. Even an MRI taken in the first 24 hours misses 15 to 20% of strokes in this part of the brain, so clinical assessment matters more than imaging alone.