Unexplained Vomiting: Common Neurological and Vestibular Causes
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- Updated October 12, 2026
When vomiting has no clear cause and dizziness or migraine comes with it, the inner ear and the brain's balance system deserve a careful look.
Unexplained vomiting in adults often has an ordinary cause behind it. Food poisoning, medicines, pregnancy, motion sickness and migraine are all common causes of vomiting, according to MedlinePlus, and a medical doctor checks those first. When the checks come back normal and the vomiting keeps arriving with dizziness, vertigo or migraine features, the inner ear and the brain's balance system are worth evaluating.
I'm Dr. Alireza Chizari, DC, DACNB, a Board-Certified Functional Neurologist in Calabasas. Many adults with this problem have already had bloodwork and a gastroenterology workup that came back normal.
If that sounds familiar, you probably know the routine. You keep crackers in the car, you check where the restroom is before a meeting starts, and you tell colleagues it was something you ate because “my tests are normal” is harder to explain. You are still working, still driving the 101, still showing up, on a fraction of your usual energy. Normal tests are useful information. They narrow the search, and they say nothing about the vomiting being imagined.
Key Takeaway
Unexplained vomiting in adults is usually checked by a medical doctor first, for common causes such as food poisoning, medicines and pregnancy. Sudden symptoms, a head injury or blood in vomit need emergency care. When tests are normal and dizziness, vertigo or migraine features persist, a neurological and vestibular evaluation can look at the inner ear and balance system.
When Is Unexplained Vomiting in Adults an Emergency?
Unexplained vomiting in adults needs emergency care when it comes with signs of a stroke, follows a blow to the head, or brings up blood.
The CDC lists sudden dizziness, trouble walking, loss of balance, trouble seeing and a sudden severe headache among the signs of stroke. Vomiting that arrives together with any of them is a reason to call 911. After a bump, blow or jolt to the head, repeated nausea or vomiting is one of the danger signs the CDC HEADS UP program names for emergency care.
MedlinePlus adds its own list. Blood or dark, coffee-colored material in the vomit, or vomiting that may come from poisoning, needs emergency care. Vomiting with a headache or stiff neck, or with severe belly pain, is a reason to seek medical care right away.
Signs that need emergency care, not a clinic visit
- Vomiting with sudden dizziness, trouble walking, loss of balance, trouble seeing or a sudden severe headache, which can be signs of stroke
- Nausea or vomiting that keeps repeating after a bump, blow or jolt to the head
- Blood or dark, coffee-colored material in the vomit, or vomiting that may come from poisoning
- Vomiting with a headache, a stiff neck or severe belly pain
If symptoms come on suddenly or severely - a sudden severe headache, weakness, trouble speaking, vision loss, or fainting - that is an emergency. Call 911 or go to an emergency room, not a clinic appointment.
What Causes Unexplained Vomiting in Adults?
Often, unexplained vomiting in adults has a common cause: food poisoning, a medicine, pregnancy, motion sickness or migraine. A medical doctor checks those first. When they are ruled out and the vomiting comes with vertigo, dizziness or migraine features, an inner-ear or brain balance cause, such as vestibular migraine or vestibular neuritis, is worth evaluating.
Start With the Medical Causes
The common medical causes of vomiting belong with your medical doctor first. Some of them call for a change of prescription, a pregnancy test or care for the gut, and none of that is what a functional neurology practice does. If you have not yet seen your primary care doctor about the vomiting, that is the first appointment to make.
Timing matters too. MedlinePlus advises contacting a provider right away when vomiting has lasted longer than 24 hours, or when you have not kept any fluids down for 12 hours or more, rather than waiting for a specialist appointment.
When Vertigo and Vomiting Come Together
Vertigo and vomiting arriving together is a pattern that several inner-ear and brain conditions share. Vestibular migraine, vestibular neuritis and BPPV can each bring nausea and vomiting alongside dizziness or vertigo, and motion sickness works through the same balance signals. Sudden dizziness is also on the stroke list above, so a first, sudden episode goes to emergency care.
When the episodes keep returning after your medical doctor has checked the common causes, the balance system is the next place to look, and that is what a dizziness evaluation in Calabasas is set up to examine.
Brain Vomit Meaning: What Is Neurological Vomiting?
“Brain vomit” and “neurological vomiting” are everyday phrases, not formal diagnoses, for vomiting set off by the brain and nervous system rather than by a problem in the stomach itself.
The brain has its own ways of starting nausea. According to Cleveland Clinic, part of the brainstem monitors the blood for signs of toxins and can trigger nausea when it detects them, and pressure on the brain can also trigger nausea and vomiting. Neither route starts in the stomach.
Neurological Nausea and Sensory Conflict
Neurological nausea can also come from mixed signals about movement. The CDC Yellow Book calls sensory conflict the most widely accepted explanation for motion sickness: the inner ear, the eyes and the body's sense of position report different things about movement, and nausea and vomiting are the main symptoms. This is the mechanism behind car and boat sickness, and it runs through the balance system rather than the gut.
Why the Pattern Matters More Than the Phrase
The label someone uses matters less than the pattern the vomiting follows. Pressure on the brain is one of the routes above. MedlinePlus also lists vomiting with a headache or stiff neck as a reason to seek medical care right away. “Brain vomit” is a reason to look closer, never a reason to wait.
Of these routes, the one a functional neurology practice works with is the balance system: the inner ear, the eyes and how the brain combines their signals. Toxins, medicines and pressure inside the skull belong to medical care and, where needed, medical neurology.
Which Inner-Ear and Brain Conditions Can Cause Vomiting?
Several inner-ear and brain conditions can cause vomiting alongside dizziness or vertigo, and each tends to follow its own pattern. The sections below cover the ones with clear published descriptions.
Vestibular Migraine: Vertigo, Sometimes Without a Headache
Vestibular migraine is a type of migraine with vertigo or swaying sensations, and nausea and vomiting can be part of it, as The Migraine Trust describes. What surprises many people is that vertigo attacks can happen without a headache at all, so someone with this pattern may not think of migraine at all.
History is part of the picture. People with a history of migraine, vertigo or vestibular disorders are more prone to motion sickness, according to the CDC Yellow Book, so lifelong car sickness can sit alongside a migraine history as one clue among several. If headaches are part of your own history, my page on headaches and migraines explains how they are evaluated.
Vestibular Neuritis: Sudden Vertigo From the Balance Nerve
Vestibular neuritis is inflammation of the inner-ear balance nerve, and experts believe a viral infection may trigger it. It brings sudden vertigo and balance problems, often with nausea and vomiting.
Sudden dizziness and loss of balance are also among the CDC's stroke signs, and that overlap matters. A first episode of sudden vertigo with vomiting needs emergency assessment before anyone calls it neuritis, and questions about rehabilitation come afterwards.
BPPV: Brief Spins When You Change Position
BPPV (benign paroxysmal positional vertigo) happens when small calcium carbonate crystals move around in the inner ear. A change in head position, such as turning over in bed, triggers brief vertigo, sometimes with nausea and vomiting. The most common treatment is a canalith repositioning procedure, a series of guided head movements that aims to move the loose crystals back to where they belong. This procedure may be part of care at my practice when the evaluation points to BPPV and it is clinically appropriate.
Motion Sickness
Motion sickness is the sensory conflict described earlier, with nausea and vomiting as its main symptoms. It belongs in this list because people with migraine or vestibular problems are more prone to it, so frequent motion sickness is worth mentioning at any evaluation.
After a Head Injury
Vomiting after a head injury belongs on the emergency list first. Repeated nausea or vomiting after a bump, blow or jolt to the head is one of the danger signs the CDC names, and it calls for emergency care right away rather than a wait for an appointment. Dizziness that lingers once the emergency has been ruled out is a separate question for later.
Cyclic Vomiting Syndrome
Cyclic vomiting syndrome causes sudden, repeated attacks of severe nausea and vomiting, according to the NIDDK. Migraine, a family history of migraine and long-term marijuana use are among its listed risk factors. It is a functional gastrointestinal disorder, so its diagnosis belongs with a medical doctor or gastroenterologist, and the migraine link is why it appears on this page.
Vomiting With Dizziness, and Normal Tests So Far?
If your medical doctor has checked the common causes and the vertigo or motion sensitivity remains, a vestibular evaluation in Calabasas can look at the inner ear and the balance system.
Is It My Stomach or My Inner Ear?
Your stomach and your inner ear can both sit behind vomiting, and what the vomiting comes with is a useful clue to which one. The table lines up the causes covered on this page with what their published descriptions say.
| Possible source | What it is associated with | Who looks at it first |
|---|---|---|
| Food poisoning | A common everyday cause of vomiting | Your medical doctor |
| A medicine | Listed among the common causes of vomiting | The prescriber or your medical doctor |
| Pregnancy | Morning sickness, a common cause of vomiting | Your medical doctor or obstetric provider |
| BPPV | Brief vertigo set off by a change in head position, sometimes with nausea and vomiting | Your medical doctor, then a vestibular evaluation |
| Vestibular neuritis | Sudden vertigo and balance problems, often with nausea and vomiting | Emergency assessment first, because sudden dizziness can be a sign of stroke |
| Vestibular migraine | Vertigo or swaying, sometimes without a headache, with nausea and vomiting possible | Your medical doctor, then a vestibular evaluation |
| Motion sickness | Nausea and vomiting from mismatched inner-ear, visual and body-position signals | Your medical doctor, and a vestibular evaluation if other balance symptoms come with it |
| Cyclic vomiting syndrome | Sudden, repeated attacks of severe nausea and vomiting; migraine and long-term marijuana use are listed risk factors | Your medical doctor or a gastroenterologist |
No table replaces an examination. It does show why the first questions in any evaluation are about pattern: what sets the vomiting off, what comes with it, and how long each episode lasts.
What “unexplained” usually means
Unexplained usually means unexplained so far. The word describes where the search has reached, and it says nothing about whether the symptoms are real. Vomiting that the first round of tests did not explain still deserves an answer, and the next step is to look at the systems those tests did not cover.
What Does a Neurological and Vestibular Evaluation Look At?
A neurological and vestibular evaluation looks at how the inner ears, the eyes and the brain's balance processing work together, since that system is where vertigo-related nausea is thought to begin.
At California Brain & Spine Center, it begins with a 120-minute neurodiagnostic assessment. Depending on the symptoms, it may include recording eye movements (videonystagmography), measuring balance on a moving platform (computerized posturography), positional testing for BPPV, and heart rate and blood pressure readings lying down and standing.
If your nausea arrives mainly when you stand up, that pattern has its own article: POTS and nausea.
What Happens After the Evaluation?
The results decide what comes next, and sometimes what comes next is a referral. When the findings point to a vestibular problem, care may include vestibular rehabilitation, which The Migraine Trust describes as a programme of exercises that aims to help the brain adapt to dizziness and improve balance. It does not suit everyone, and during a very active phase of vestibular migraine it may come after medication and lifestyle changes, which your medical doctor manages.
What the evaluation does not do matters as much. It does not diagnose stomach or medication causes, and it does not replace medical neurology when the history points to the brain itself. When an examination suggests a problem outside my scope, I say so plainly and send you back to your medical doctor with the findings.
What Should I Track Before the Appointment?
A short symptom log gives whoever evaluates you the pattern that a single visit cannot show. A note on your phone is enough:
- When each episode starts, how long it lasts, and the time of day
- What you were doing: turning your head, riding in a car, standing up, reading or looking at a screen
- What came with it, such as spinning, swaying or a headache, light or sound sensitivity, or ear symptoms
- Any medicine started, stopped or changed, and what you ate in the hours before
For steps to talk over with your doctor in the meantime, my article on remedies for nausea collects practical options.
What Do Patients Ask Me Before a First Visit?
Patients often ask me whether they should keep seeing their own doctor, what the first visit involves, and whether a normal workup rules out anything serious.
To the first, I always say yes. A vestibular evaluation works alongside primary care, gastroenterology and medical neurology, and I am glad to share the findings with the doctors you already see.
The first visit is the 120-minute neurodiagnostic assessment. I go through the history in detail, run the tests that fit the symptoms, and explain each result before we talk about a plan. If the findings point outside functional neurology, the plan is a referral.
On the third question, a normal workup narrows the search without closing it. The emergency signs at the top of this page apply on any day, whatever earlier tests showed.
One more question patients often ask me is whether they need to be dizzy on the day of the visit. They do not. The tests look at how the balance system is working, and the log you bring shows what happens in daily life.
“Dr. Chizari took the time to listen, explain what was going on, and create a plan that felt personalized to me.”
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Dr. Alireza Chizari, DC, DACNB, sees adults with dizziness, vertigo and vomiting at California Brain & Spine Center in Calabasas, a functional neurology practice on Park Granada that many people reach along the 101 from Woodland Hills and the rest of the West Valley.
Frequently Asked Questions About Unexplained Vomiting
These are the questions about unexplained vomiting that come up most often, answered briefly.
Is Neuro Vomit a Real Medical Diagnosis?
No. “Neuro vomit”, “brain vomit” and “neurological vomiting” are everyday phrases rather than diagnoses. They describe vomiting set off through the nervous system, for example by the brainstem sensing toxins, by pressure on the brain, or by conflicting balance signals. MedlinePlus lists vomiting with a headache or stiff neck as a reason to seek medical care right away.
Can Vestibular Migraine Cause Vomiting Without a Headache?
It can. Vestibular migraine is a type of migraine with vertigo or swaying sensations, and nausea and vomiting can be part of an attack. Vertigo attacks can happen without a headache, so unexplained vomiting in adults with recurring dizziness and a personal history of migraine is worth raising with whoever evaluates you.
How Long Is Too Long to Wait With Unexplained Vomiting?
Not long. MedlinePlus advises contacting a provider right away if vomiting has lasted longer than 24 hours or you have not kept any fluids down for 12 hours or more. For unexplained vomiting in adults that keeps returning over weeks, a medical doctor's workup comes first, then a vestibular evaluation if dizziness persists.
What Is FND Vomiting, and Is It the Same as Functional Neurology?
FND stands for functional neurological disorder, a diagnosis separate from the field I practice despite the shared word. Functional neurology is a way of examining how the nervous system is working. If FND has been raised for you, the clinician who raised it is the right person to ask, and a vestibular evaluation can look at balance-related nausea.
Where Can I Get Vertigo and Vomiting Evaluated Near Calabasas?
California Brain & Spine Center is at 4768 Park Granada, Ste 107, in Calabasas, and sees adults from across the Los Angeles area. The first visit is a 120-minute neurodiagnostic assessment of the inner ear, eye movements and balance, after your medical doctor has checked the common causes of unexplained vomiting in adults.
Can Vestibular Neuritis Cause Vomiting?
Yes, it can. Vestibular neuritis is inflammation of the inner-ear balance nerve, thought to be triggered by a viral infection, and it brings sudden vertigo and balance problems, often with nausea and vomiting. Because sudden dizziness can also be a sign of stroke, a first episode like this needs urgent medical assessment before any rehabilitation.
Unexplained vomiting in adults wears people down in a way that is hard to describe to anyone who has not lived with it. If the common causes have been checked and the vomiting still travels with dizziness, vertigo or migraine features, I would like to help you look at the balance system carefully, and to tell you plainly if what I find belongs with another clinician.
California Brain & Spine Center | (818) 649-5300 | Calabasas, CA 91302. You can book online at californiabrainspine.janeapp.com.
This content is for educational purposes only and is not medical advice. Consult a qualified healthcare provider about your specific situation.
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Dr. Alireza Chizari
This article has been medically reviewed for clinical accuracy by Dr. Alireza Chizari, DC, DACNB. Committed to evidence-based practice, Dr. Chizari ensures all content reflects the highest standards of functional neurology care.
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FAQ
What is Functional Neurology?
Functional Neurology is a healthcare specialty that focuses on assessing and rehabilitating the nervous system’s function. It emphasizes neuroplasticity—the brain’s ability to adapt and reorganize—using non-invasive, evidence-based interventions to improve neurological performance.
How does Functional Neurology differ from traditional neurology?
Traditional neurology often concentrates on diagnosing and treating neurological diseases through medications or surgery. In contrast, Functional Neurology aims to optimize the nervous system’s function by identifying and addressing dysfunctions through personalized, non-pharmaceutical interventions.
Is Functional Neurology a replacement for traditional medical care?
No. Functional Neurology is intended to complement, not replace, traditional medical care. Practitioners often collaborate with medical professionals to provide comprehensive care.
What conditions can Functional Neurology help manage?
Functional Neurology has been applied to various conditions, including:
• Concussions and Post-Concussion Syndrome
• Traumatic Brain Injuries (TBI)
• Vestibular Disorders
• Migraines and Headaches
• Neurodevelopmental Disorders (e.g., ADHD, Autism)
• Movement Disorders
• Dysautonomia
• Peripheral Neuropathy
• Functional Neurological Disorder (FND)
Can Functional Neurology assist with neurodegenerative diseases?
While Functional Neurology does not cure neurodegenerative diseases, it can help manage symptoms and improve quality of life by optimizing the function of existing neural pathways.
What diagnostic methods are used in Functional Neurology?
Functional Neurologists employ various assessments, including:
• Videonystagmography (VNG)
• Computerized Posturography
• Oculomotor Testing
• Vestibular Function Tests
• Neurocognitive Evaluations
How is a patient’s progress monitored?
Progress is tracked through repeated assessments, patient-reported outcomes, and objective measures such as balance tests, eye movement tracking, and cognitive performance evaluations.
What therapies are commonly used in Functional Neurology?
Interventions may include:
- Vestibular Rehabilitation
- Oculomotor Exercises
- Sensorimotor Integration
- Cognitive Training
- Balance and Coordination Exercises
- Nutritional Counseling
- Lifestyle Modifications
Are these therapies personalized?
Absolutely. Treatment plans are tailored to the individual’s specific neurological findings, symptoms, and functional goals.
Who can benefit from Functional Neurology?
Individuals with unresolved neurological symptoms, those seeking non-pharmaceutical interventions, or patients aiming to optimize brain function can benefit from Functional Neurology.
Is Functional Neurology suitable for children?
Yes. Children with developmental delays, learning difficulties, or neurodevelopmental disorders may benefit from Functional Neurology approaches.
How does Functional Neurology complement other medical treatments?
It can serve as an adjunct to traditional medical care, enhancing outcomes by addressing functional aspects of the nervous system that may not be targeted by conventional treatments.
How is technology integrated into Functional Neurology?
Technological tools such as virtual reality, neurofeedback, and advanced diagnostic equipment are increasingly used to assess and enhance neurological function.
What is the role of research in Functional Neurology?
Ongoing research continues to refine assessment techniques, therapeutic interventions, and our understanding of neuroplasticity, contributing to the evolution of Functional Neurology practices.
