From ear clips to ultrasound treatments, the vagus nerve is attracting attention in Long Covid research. But can stimulating it actually improve fatigue, POTS or other symptoms?
Does Vagus Nerve Stimulation Work for Long Covid?
Vagus nerve stimulation Long Covid research is attracting attention, particularly among people experiencing fatigue, POTS, dizziness and digestive problems. But can stimulating the vagus nerve actually improve these symptoms, or are the devices being marketed moving faster than the science? From electrical ear stimulation to focused ultrasound, we explore what researchers have discovered, what remains uncertain and whether any of these approaches are worth considering.
In a 2026 trial involving 45 people with Long Covid fatigue, electrical ear stimulation performed no better than a sham device. Focused ultrasound has shown interesting effects on inflammation in other research, but it has not been established as a Long Covid treatment.
The vagus nerve is a promising area of research. That doesn’t mean the gadgets being sold to stimulate it are proven to work.
Key Insights
- The vagus nerve helps regulate heart rate, digestion and other automatic functions. This makes it relevant to symptoms such as dizziness, palpitations and digestive problems.
- Ultrasound scans have detected vagus nerve differences in small groups of people with Long Covid. These findings are preliminary.
- Focused ultrasound may influence inflammatory signalling, but evidence of benefit for Long Covid patients is lacking.
- Electrical ear stimulation has been tested in Long Covid, with encouraging small studies but a negative sham-controlled trial in 2026.
- A vagus nerve scan and a vagus nerve treatment are completely different things.
- You don’t need to buy a device to manage Long Covid. Existing treatments for specific symptoms and appropriate pacing remain important.
Could My Vagus Nerve Be Behind My Long Covid Symptoms?
Perhaps you’ve experienced this.
You stand up and your heart starts racing.
Your stomach seems to have forgotten how digestion works.
You feel dizzy, exhausted or strangely overstimulated by things that never bothered you before.
Then you read something about the vagus nerve.
Suddenly, it sounds like an explanation for everything.
And before long, an advertisement appears promising to reset your nervous system with a small device attached to your ear.
Convenient timing.
But is there actual science behind it?
Yes, there is some interesting research.
The difficulty is separating three very different ideas:
- Looking at the vagus nerve using ultrasound.
- Using focused ultrasound to influence nerve activity or inflammation.
- Using electrical stimulation to activate branches of the vagus nerve.
They sound related, and they are. But they don’t have the same evidence, and none is currently an established treatment for Long Covid.
Let’s look at what researchers have actually found.
What Is the Vagus Nerve, and Why Does It Matter?
The vagus nerve is one of the body’s major communication pathways between the brain and internal organs.
It helps regulate functions you normally don’t have to think about, including:
- Heart rate and cardiovascular reflexes
- Digestion and gut movement
- Swallowing and aspects of voice control
- Communication between internal organs and the brain
- Certain pathways involved in regulating inflammation
It’s also part of the parasympathetic nervous system, which helps coordinate functions associated with rest and digestion.
You may have heard it described as the body’s calming nerve.
That’s a useful shortcut, but it’s not the whole story.
The vagus nerve carries different types of signals, and stimulating it doesn’t simply switch the body from stress mode to relaxation mode.
Why Are Researchers Interested in It for Long Covid?
Because many people with Long Covid experience problems involving the autonomic nervous system.
This is the system that automatically regulates heart rate, blood pressure, temperature control, digestion and other essential functions.
When it doesn’t work properly, symptoms can include:
- Racing heart or palpitations
- Dizziness when standing
- Feeling faint
- Digestive disturbances
- Abnormal sweating or temperature regulation
- Exercise intolerance
Some people develop postural orthostatic tachycardia syndrome (POTS) or another form of dysautonomia.
The vagus nerve is involved in parts of this system, making it a reasonable research target.
But dysautonomia does not automatically mean the vagus nerve itself is damaged.
And not every Long Covid symptom can be explained by one nerve.
Can an Ultrasound Scan Show Vagus Nerve Damage After COVID?
Researchers have found differences in the appearance of the vagus nerve in some people with Long Covid.
A Spanish pilot study compared 30 people with Long Covid and symptoms suggesting vagus nerve dysfunction with 14 people who had recovered from COVID and 16 people who had never been infected.
The researchers used ultrasound to examine the nerve in the neck.
They found that participants with Long Covid were more likely to have a vagus nerve that appeared thicker and brighter on ultrasound.
That sounds important.
And it might be.
But there are several things the study cannot tell us.
It doesn’t prove that COVID directly damaged the vagus nerve.
It doesn’t show that every person with Long Covid has the same abnormality.
And it doesn’t establish that measuring the nerve can diagnose Long Covid.
The participants were also selected because they already had symptoms suggesting vagus nerve involvement.
That makes the findings interesting, but not necessarily representative of everyone with Long Covid.
Should You Ask Your Doctor for a Vagus Nerve Ultrasound?
Not routinely.
A vagus nerve ultrasound is not currently a standard diagnostic test for Long Covid.
Researchers still need to establish how reliable these measurements are, what abnormal findings mean and whether they can guide treatment.
If you’re experiencing palpitations, dizziness or suspected POTS, an appropriate autonomic or cardiovascular assessment is generally more useful than requesting a specialised nerve scan without a clear clinical indication.
The important distinction: an ultrasound scan can help researchers observe a nerve. It doesn’t treat the nerve.
Can Focused Ultrasound Reduce Inflammation?
This is where things become more interesting.
Ultrasound isn’t always used for imaging.
Researchers can also direct carefully controlled sound waves towards specific tissues to influence biological activity.
This is known as focused ultrasound neuromodulation.
Unlike an ordinary scan, the aim is to produce a biological effect.
What Did Researchers Find?
In one randomised, sham-controlled study, researchers directed focused ultrasound towards the spleen in healthy volunteers.
The spleen is involved in immune function, and researchers are interested in its connections with neural pathways that regulate inflammation.
After treatment, blood samples were stimulated in the laboratory to examine inflammatory responses.
Researchers observed reduced production of tumour necrosis factor, or TNF, an inflammatory signalling protein.
That’s an interesting finding because it suggests that ultrasound may be able to influence aspects of the body’s inflammatory response without surgery.
But here’s the catch.
The study did not demonstrate that focused ultrasound improves Long Covid symptoms.
The participants were healthy volunteers.
The researchers measured a laboratory immune response, not improvement in fatigue, brain fog, POTS or quality of life.
And a reduction in one inflammatory marker doesn’t necessarily translate into a meaningful clinical benefit.
What About Animal Studies?
Other experiments have investigated whether abdominal ultrasound can activate nerve pathways, including vagal fibres, and influence inflammation in animals.
These studies help researchers explore possible mechanisms.
But animal experiments cannot establish that the same intervention will be safe or effective for people with Long Covid.
The biology is promising enough to investigate.
It is not yet evidence for buying an ultrasound treatment.
Is Focused Ultrasound the Same as a Home Ultrasound Device?
No.
Clinical focused ultrasound research uses carefully controlled equipment, anatomical targeting and specific stimulation settings.
A consumer device advertised as using ultrasound or sound waves may work very differently.
Even if a commercial product uses genuine ultrasound technology, that doesn’t mean it reproduces the effects seen in clinical experiments.
Nor does it mean those effects would help Long Covid.
Before considering a product, ask:
Has this exact device been tested in people with Long Covid, using meaningful symptom outcomes and an appropriate control group?
If the answer is no, claims about resetting inflammation or repairing the vagus nerve should be treated cautiously.
What Is Electrical Vagus Nerve Stimulation?
Electrical vagus nerve stimulation is different from ultrasound.
Instead of sound waves, it uses electrical impulses.
Some established medical treatments use implanted vagus nerve stimulators for particular conditions, such as certain forms of epilepsy.
Researchers are also investigating non-invasive approaches that stimulate the nerve through the skin.
One approach is called transcutaneous auricular vagus nerve stimulation, usually shortened to taVNS.
It uses electrodes placed on specific areas of the outer ear.
The idea is to stimulate nerve fibres that communicate with brain regions involved in autonomic regulation.
It’s an interesting approach because it doesn’t require surgery.
But an interesting mechanism doesn’t guarantee that a treatment works.
Can Ear Vagus Nerve Stimulation Improve Long Covid Fatigue?
This is one of the most useful questions for patients.
Fatigue can be among the most disabling Long Covid symptoms.
And if a relatively simple device could meaningfully reduce it, that would be important.
Researchers have started testing this possibility.
The 2026 COVIVA Trial: What Happened?
A randomised, sham-controlled pilot trial published in April 2026 investigated electrical ear stimulation in 45 people with Long Covid-related fatigue.
Participants were assigned to three groups:
- Electrical stimulation at a noticeable intensity
- Electrical stimulation below the level they could feel
- Sham stimulation
The treatment period lasted four weeks, with participants instructed to use the device for four hours each day.
Researchers measured fatigue, quality of life and other outcomes.
Did It Work?
The researchers found no statistically significant advantage for active stimulation compared with sham stimulation.
Participants across the groups showed some improvement over time, but the active treatment did not perform better than the control.
This matters.
Without a sham group, it would have been easy to look at people improving during treatment and conclude that the device was responsible.
The controlled comparison showed that the evidence was not that simple.
Possible explanations for improvement across groups include symptom fluctuations, expectation effects and other influences unrelated to the electrical stimulation itself.
The trial was small, so it doesn’t rule out benefits from different protocols or in particular patient groups.
But it does mean we cannot currently say that ear vagus nerve stimulation is an effective treatment for Long Covid fatigue.
What About Earlier Positive Studies?
A smaller randomised pilot study published in 2022 reported encouraging findings with at-home ear stimulation.
Another study explored the feasibility of using a TENS device for auricular stimulation in women with Long Covid fatigue.
These studies contributed useful early information about feasibility and potential benefits.
However, small studies have important limitations.
When results are mixed, larger and carefully controlled trials are needed before recommending a treatment.
Current evidence: experimental, with no established clinical benefit for Long Covid.
Could Vagus Nerve Stimulation Help POTS or Dysautonomia?
This is another understandable question.
If your heart races when you stand up, it can seem logical to stimulate a nerve involved in heart rate regulation.
But POTS is not simply a vagus nerve that needs switching back on.
POTS and other autonomic disorders can involve several interacting mechanisms, including changes in blood circulation, blood volume and autonomic regulation.
Some research outside Long Covid has investigated vagus nerve stimulation for autonomic conditions.
However, we do not yet have convincing evidence that commercially available vagus nerve stimulation devices reliably improve Long Covid-related POTS.
And stimulating the vagus nerve can itself affect heart rate and other physiological responses.
If you have POTS, fainting episodes, significant palpitations or another cardiovascular condition, discuss any proposed electrical stimulation with a clinician familiar with your medical history.
A device should not replace appropriate assessment and established symptom-management approaches.
Could It Help Brain Fog, Sleep or Digestive Problems?
Possibly in theory, but this is where we need to be particularly careful.
The vagus nerve communicates with several systems involved in digestion, autonomic function and signalling between the body and brain.
That makes it relevant to researchers investigating:
- Digestive disturbances
- Sleep and autonomic regulation
- Cognitive symptoms
- Inflammatory signalling
- Fatigue
But being connected to these functions does not prove that stimulating the nerve will improve them.
For example, if your digestion has changed since COVID, the problem might involve autonomic dysfunction, medication effects, gastrointestinal disease or other mechanisms.
Similarly, brain fog may involve several biological processes that cannot be reduced to one nerve.
The research needs to establish which patients, if any, benefit, which symptoms improve and whether the improvements are meaningful.
Until then, claims that vagus nerve stimulation treats multiple Long Covid symptoms should be viewed as hypotheses rather than established facts.
Can You Reset Your Vagus Nerve Naturally?
You may have seen advice about humming, singing, cold showers, breathing exercises or listening to calming music.
Some of these activities can influence breathing, relaxation or aspects of autonomic activity.
But there is no established technique that simply resets a damaged or dysfunctional vagus nerve.
And changes in heart-rate variability or a temporary feeling of calm don’t demonstrate that Long Covid has been treated.
Gentle relaxation techniques may still be useful if they feel comfortable and don’t worsen symptoms.
For example, quiet music or relaxed, unforced breathing might help you manage stress or settle before sleep.
They are not cures.
Avoid prolonged breath-holding, forced breathing or cold-water challenges if they trigger dizziness, palpitations or other symptoms.
For people with PEM, even seemingly gentle activities should be adapted to individual tolerance.
Should You Buy a Vagus Nerve Stimulation Device?
This is where I’d be particularly cautious.
Some devices are marketed using phrases such as:
- Reset your nervous system
- Activate your healing response
- Reduce inflammation naturally
- Restore vagal tone
- Recover from Long Covid
These statements may sound scientific, but they often go beyond the available evidence.
Before spending money, consider the following.
1. Has the Device Been Studied in Long Covid?
Research on another condition doesn’t automatically establish benefit for Long Covid.
2. Was It Compared With a Sham Device?
If everyone knows they’re receiving treatment, it becomes difficult to separate the treatment’s effect from expectation, symptom fluctuations and other influences.
3. Did Patients Actually Feel Better?
Changes in biomarkers or physiological measurements are interesting, but patients need meaningful improvements in symptoms and daily functioning.
4. Is It Suitable for Your Medical History?
Electrical stimulation may be unsuitable for some people, particularly those with certain implanted devices, heart rhythm problems or neurological conditions.
5. What Will It Cost?
An expensive device is not necessarily a more effective one.
And the financial burden matters when Long Covid may already have affected your ability to work.
You should not feel that you’re missing an established treatment because you cannot afford a vagus nerve gadget.
At present, the evidence doesn’t justify that conclusion.
Is Vagus Nerve Stimulation Safe?
Small studies of non-invasive ear stimulation have generally reported mild side effects, including skin irritation and dizziness.
However, safety findings from small, supervised studies cannot be applied automatically to every device or every patient.
Risks depend on the device, stimulation settings, placement and individual medical circumstances.
Speak with a qualified clinician before considering electrical stimulation, particularly if you have:
- A pacemaker or another implanted electrical device
- Significant heart rhythm abnormalities
- Recurrent fainting or unstable cardiovascular symptoms
- Epilepsy or another relevant neurological condition
Do not improvise ear stimulation using a general-purpose TENS machine unless it is part of a clinically supervised protocol.
And don’t assume that because something is sold for home use, it is appropriate for your particular condition.
What Should You Ask Your Long Covid Doctor?
If you’re interested in vagus nerve research, you don’t need to arrive at your appointment with a shopping list of devices.
These questions may be more useful:
- Could my symptoms suggest POTS or another form of dysautonomia?
- Are there established tests that would help investigate my symptoms?
- Would a specialist autonomic assessment be appropriate?
- Are there clinical trials investigating vagus nerve stimulation that I might be eligible for?
- Could electrical stimulation pose risks given my medical history or medications?
The aim is to identify what is happening in your body and what can be managed safely — not to assume that every symptom must be caused by the vagus nerve.
What Research Still Needs to Answer
There are several important unanswered questions.
Does vagus nerve dysfunction contribute directly to Long Covid? Small imaging studies suggest possible involvement in some patients, but the mechanisms are not established.
Can focused ultrasound improve Long Covid symptoms? We need clinical trials measuring outcomes that matter to patients, not only laboratory markers.
Could electrical stimulation help particular subgroups? Larger studies may clarify whether people with specific autonomic features respond differently.
What dose and treatment schedule would work? Different devices and protocols cannot be assumed to have identical effects.
Are improvements sustained? Even if a treatment helps in the short term, researchers need to establish whether benefits last and whether there are meaningful safety concerns.
These are worthwhile questions.
But they’re still research questions.
Final Thoughts: An Interesting Nerve Is Not the Same as a Proven Treatment
The vagus nerve is genuinely fascinating.
It connects the brain with many of the systems that seem to behave differently in Long Covid.
Researchers have found changes in some patients, explored ways to influence inflammation and begun testing electrical stimulation.
That’s progress.
But there’s a big difference between identifying a possible mechanism and discovering a treatment that works.
A scan showing an unusual-looking nerve doesn’t prove that a device can repair it.
A laboratory reduction in inflammation doesn’t mean fatigue will improve.
And a patient feeling better during treatment doesn’t necessarily mean the treatment caused the improvement.
Long Covid deserves serious research, including treatments that target the nervous system. It also deserves protection from promises that move faster than the evidence.
Stay curious about the science.
Just don’t let an advertisement convince you that your recovery depends on buying the latest gadget.
Frequently Asked Questions
Can ultrasound treat Long Covid?
Focused ultrasound is being investigated for its effects on nerve signalling and inflammation, but it is not an established treatment for Long Covid. Ultrasound scans used to examine the vagus nerve are diagnostic research tools, not treatments.
Can COVID damage the vagus nerve?
Small studies have identified vagus nerve differences in some people with Long Covid. However, these findings do not prove that SARS-CoV-2 directly damaged the nerve or that all patients have vagus nerve abnormalities.
Does vagus nerve stimulation help Long Covid fatigue?
Evidence is mixed. Some early pilot studies reported encouraging findings, but a 2026 sham-controlled trial involving 45 people found no significant benefit over sham stimulation.
Can vagus nerve stimulation help POTS?
It is being investigated in autonomic research, but it is not an established treatment for Long Covid-related POTS. Appropriate cardiovascular and autonomic assessment remains important.
Can vagus nerve stimulation reduce inflammation?
Some experimental research suggests that particular stimulation approaches can influence inflammatory signalling. However, this does not establish that they reduce clinically important inflammation or improve Long Covid symptoms.
Are vagus nerve stimulation devices safe to use at home?
Safety depends on the device, settings and medical history. Small trials have reported mostly mild adverse effects, but people with heart conditions, implanted devices or neurological disorders should seek medical advice before considering electrical stimulation.
Can humming or breathing exercises repair the vagus nerve?
There is no convincing evidence that humming or breathing exercises repair vagus nerve damage or cure Long Covid. Gentle relaxation may help some people feel calmer, but it should not be confused with disease treatment.
Should I get a vagus nerve ultrasound?
Not routinely. Vagus nerve ultrasound is not an established diagnostic test for Long Covid. Your clinician can advise whether more established autonomic or cardiovascular investigations are appropriate.
Suggested Reading on Long Covid Journey
Tinnitus and Vision Problems After COVID: Why Tests Are Normal
Why tinnitus, ear problems and sensory symptoms can persist after COVID, even when routine tests appear normal.
The Cure for Long COVID: Apparently, It’s Everything
From experimental therapies to miracle cures, explore why so many treatments are promoted for Long Covid and what the evidence actually supports.
Dysautonomia in Long COVID: Why Does Everything Feel So Much Harder?
Understand how disruption of the autonomic nervous system can affect heart rate, digestion, temperature regulation and everyday life.
POTS and Orthostatic Intolerance: What You Need to Know
Why standing up can trigger dizziness, palpitations and exhaustion, and what this tells us about autonomic dysfunction.
Long Covid Fatigue: Everything You Need to Know in 4 Minutes
Why Long Covid fatigue is different from ordinary tiredness, what researchers are investigating and what may help manage symptoms.
Long COVID Brain Fog: Symptoms, Causes, Treatment and Research
Explore the possible neurological and biological mechanisms behind brain fog, including inflammation and changes in nervous-system function.
Research and References
- Lladós et al. (2024). Vagus nerve dysfunction in the post–COVID-19 condition: a pilot cross-sectional study.Clinical Microbiology and Infection.
https://pubmed.ncbi.nlm.nih.gov/37984511/ - Vagus nerve cross-sectional area on ultrasound and inflammatory biomarkers in hospitalised COVID-19 patients.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13600550/ - Zanos et al. Focused ultrasound neuromodulation of the spleen activates an anti-inflammatory response in humans.
https://www.sciencedirect.com/science/article/pii/S1935861X23017436 - Abdominal ultrasound activates afferent vagus nerve fibres and induces anti-inflammatory effects.
https://pmc.ncbi.nlm.nih.gov/articles/PMC12912971/ - Gierthmuehlen et al. (2026). Transcutaneous Auricular Vagal Nerve Stimulation Against Fatigue Syndrome in Patients with Long COVID: Results of the Randomized, Placebo-Controlled Clinical Pilot Trial COVIVA.Neurology and Therapy.
https://doi.org/10.1007/s40120-026-00928-w - Badran et al. (2022). A pilot randomized controlled trial of supervised, at-home, self-administered transcutaneous auricular vagus nerve stimulation to manage long COVID symptoms.
https://pmc.ncbi.nlm.nih.gov/articles/PMC9402278/ - Feasibility and acceptance of auricular vagus nerve stimulation using a TENS device in women with Long Covid fatigue (2025).
https://link.springer.com/article/10.1007/s00508-025-02501-1
Medical Disclaimer: Long Covid Journey is a patient-led educational resource. This article is not medical advice and does not replace assessment or treatment by a qualified healthcare professional. Do not use electrical or ultrasound devices to treat Long Covid without appropriate clinical guidance, particularly if you have cardiovascular or neurological conditions or implanted medical devices.
Research reviewed: October 2026.