Vagus Nerve Stimulation: Understanding the Vagus Nerve, Its Symptoms and Treatment Options in Brisbane
By Emrys Goldsworthy | Brisbane, Australia
The vagus nerve has become one of the most discussed nerves in health and wellbeing. From anxiety and digestive problems to chronic fatigue, inflammation and autonomic dysfunction, increasing attention is being given to the role this remarkable nerve plays in regulating our health.
With this interest has come an explosion of vagus nerve stimulators, home exercises and techniques claiming to "reset" the nervous system.
But what does stimulating the vagus nerve actually achieve? Can it help regulate an overactive or underactive nervous system? And are all methods of vagus nerve stimulation equally effective?
The answers are more complicated than much of the information circulating online suggests.
In my Brisbane clinical practice, I focus on assessing autonomic nervous system function and exploring targeted therapeutic approaches, particularly transcutaneous auricular vagus nerve stimulation (taVNS), auricular needling, vibrotactile stimulation and photobiomodulation, commonly called low-level laser or light therapy.
Understanding how these treatments work, what the research supports and when they may be inappropriate is essential.
What Is the Vagus Nerve and Why Is It So Important?
The vagus nerve is the tenth cranial nerve and one of the body's most extensive communication pathways.
It originates in the brainstem, travels through the neck and chest, and communicates with numerous organs, including the heart, lungs and digestive tract.
It is a major component of the parasympathetic nervous system, which contributes to functions such as digestion, cardiovascular regulation and physiological recovery.
However, the vagus nerve is much more than a nerve that helps us relax. Approximately 80% of its fibres are sensory, carrying information from the body towards the brain. This makes it an important pathway through which the brain monitors conditions within the body.
Through its connections with the brainstem and broader neural networks, vagal signalling can influence systems involved in:
Heart rate and cardiovascular regulation
Breathing and respiratory reflexes
Gastric motility, digestion and gastrointestinal sensation
Nausea and vomiting
Stress responses and emotional regulation
Mood, attention and aspects of cognition
Inflammatory signalling and immune regulation
Of particular interest are its connections with the nucleus tractus solitarius in the brainstem, which communicates with structures including the locus coeruleus, raphe nuclei and wider networks involving the amygdala, hippocampus and prefrontal cortex.
These networks participate in attention, emotional processing, memory, arousal and behavioural responses.
This helps explain why researchers are increasingly investigating vagus nerve stimulation for conditions extending well beyond the digestive system.
The Vagus Nerve, Sleep and Melatonin
The autonomic nervous system is closely connected with the regulation of sleep and wakefulness.
Although melatonin secretion from the pineal gland is primarily controlled by the circadian system through sympathetic pathways, vagal signalling may indirectly influence sleep through its effects on arousal, stress and brain activity.
Early research into auricular vagus nerve stimulation has reported improvements in some sleep outcomes, although this does not establish that stimulation directly increases melatonin production.
What Happens When the Vagus Nerve Is Not Functioning Normally?
The term vagal dysfunction describes disturbances in vagal signalling or function. These may occur alongside broader conditions affecting the autonomic nervous system, collectively referred to as dysautonomia.
Clinically, it can be helpful to consider whether someone demonstrates reduced parasympathetic cardiovascular regulation, an exaggerated vagally mediated reflex, or a more complex combination of autonomic disturbances.
These states are not always straightforward.
Reduced Vagal Activity or Low Vagal Tone
Reduced vagally mediated cardiovascular regulation may occur alongside symptoms such as:
An elevated resting heart rate
Reduced heart rate variability
Difficulty recovering from physiological stress
Anxiety or increased physiological arousal
Changes in breathing patterns
Digestive problems such as constipation, bloating and altered gastric motility may also occur in some disorders involving autonomic dysfunction.
Excessive Vagal Responses or Hypervagal States
The opposite scenario also deserves attention.
Some individuals experience exaggerated vagally mediated cardiovascular reflexes, most recognisably in vasovagal syncope.
During these episodes, the body may experience a sudden decrease in heart rate, blood pressure or both.
Associated symptoms can include nausea, sweating, dizziness, abdominal discomfort, weakness and fainting.
The vagus nerve is also involved in nausea and vomiting reflexes. Sensory signals from the gastrointestinal tract can help activate protective responses when the body detects potentially harmful substances or irritation.
These symptoms can arise through multiple mechanisms and require individual assessment.
The key point is that not everyone benefits from the same stimulation strategy. An intervention intended to increase vagally mediated activity may be inappropriate for someone with certain cardiovascular responses or medical conditions.
This is why understanding the individual matters more than simply attempting to stimulate the nerve.
What Is Vagus Nerve Stimulation?
Vagus nerve stimulation, often abbreviated VNS, refers to techniques intended to activate neural pathways associated with the vagus nerve.
There are several approaches.
Traditional implanted VNS uses surgically placed electrodes around the cervical vagus nerve and is an established treatment for selected medical conditions, including certain forms of drug-resistant epilepsy.
Non-invasive approaches attempt to influence vagal pathways without surgically implanting electrodes.
One of the most researched is transcutaneous auricular vagus nerve stimulation, or taVNS.
Other approaches include mechanical stimulation, auricular needling and light-based therapies, although their evidence bases differ considerably.
Transcutaneous Auricular Vagus Nerve Stimulation (taVNS)
Transcutaneous auricular vagus nerve stimulation involves delivering controlled electrical impulses through the skin of the outer ear.
The technique targets regions supplied partly or predominantly by the auricular branch of the vagus nerve, sometimes called Arnold's nerve.
This is particularly important because it provides a relatively accessible way of influencing vagal sensory pathways without placing electrodes directly over the deeper cervical vagus nerve.
Why the Cymba Concha and Cavum Concha?
Two important anatomical regions are the cymba concha and cavum concha.
The cymba concha is the upper hollow region of the external ear, while the cavum concha is the lower hollow region adjacent to the ear canal.
Anatomical research suggests that the cymba concha has particularly strong innervation from the auricular branch of the vagus nerve. The cavum concha also receives vagal innervation, although its nerve supply is more mixed.
Both areas have been investigated in taVNS research.
Bilateral Auricular Vagus Nerve Stimulation Using TENS
In my clinical approach, particular attention is given to electrical stimulation of the cymba concha and cavum concha using specialised clip electrodes, with stimulation delivered to both ears simultaneously where clinically appropriate.
This uses the principle of transcutaneous electrical nerve stimulation (TENS), although auricular vagus nerve stimulation differs from conventional TENS used for musculoskeletal pain.
Electrical impulses are delivered to selected auricular regions with the intention of recruiting sensory nerve fibres and influencing neural signalling.
The frequency, pulse characteristics, intensity, electrode configuration, stimulation duration and choice of unilateral or bilateral stimulation can all influence the physiological response.
Importantly, research has not established a universally optimal treatment protocol.
What Does the Research Say About taVNS?
Research into taVNS has expanded considerably.
A 2024 scoping review examined 109 studies across 21 clinical populations and reported encouraging therapeutic signals in several areas, while identifying substantial differences in treatment protocols and study quality.
A 2025 systematic review and meta-analysis involving six randomised controlled trials and 716 participants found improvements in functional dyspepsia symptoms and quality of life compared with sham stimulation.
Research has also investigated taVNS for depression, anxiety, sleep disturbances, stroke rehabilitation, cognition and other neurological conditions.
Auricular Needling: Another Method of Vagal Stimulation
Electrical stimulation is not the only way of interacting with sensory pathways in the ear.
Auricular needling involves the placement of fine needles into selected regions of the external ear.
When applied to areas supplied by the auricular branch of the vagus nerve, needling may provide sensory input capable of influencing autonomic responses.
An exploratory human study published in Heart Rhythm O2 found that auricular acupuncture in a vagally innervated region was associated with a modest reduction in heart rate and changes in certain heart rate variability measurements.
Auricular Needling Combined With Vibration
An additional approach involves combining auricular needling with carefully controlled mechanical vibration.
The proposed rationale is that vibration may provide additional sensory input through mechanosensitive pathways in the external ear.
Vibration itself is an emerging area of vagus nerve research.
In 2025, researchers investigated vibrotactile stimulation of the auricular region in seven patients undergoing intracranial monitoring for epilepsy.
They observed changes in neural connectivity involving limbic brain structures, with responses varying according to vibration frequency.
This is an interesting finding because it suggests that mechanical stimulation of the ear can influence activity in networks associated with emotion, memory and arousal.
Laser Therapy and Photobiomodulation for the Vagus Nerve
Another approach I use in my practice involves light therapy, often referred to as photobiomodulation (PBM) or low-level laser therapy.
Photobiomodulation uses specific wavelengths of red or near-infrared light to interact with biological tissue.
Unlike electrical stimulation, which directly creates an electrical field capable of recruiting nerve fibres, photobiomodulation is being investigated for its effects on cellular signalling and tissue physiology.
Two regions of clinical interest are:
The auricular region: Light is applied to areas associated with the auricular branch of the vagus nerve.
The cervical region: Light is applied externally over anatomical areas associated with the course of the vagus nerve in the neck.
These are different applications, particularly because the cervical vagus nerve lies considerably deeper than the superficial sensory nerves of the ear.
Whether an externally applied laser delivers sufficient energy to directly influence the cervical nerve depends on factors including tissue depth, wavelength, dosage and device characteristics.
Can Vagus Nerve Stimulation Increase or Decrease Vagal Tone?
An important aspect of treatment is understanding that autonomic regulation is not simply about maximising parasympathetic activity.
The sympathetic and parasympathetic nervous systems work together, constantly adjusting their activity to meet the body's changing requirements.
A healthy nervous system must be able to increase physiological activation when required and return towards an appropriate resting state afterwards.
The aim of a carefully selected intervention is therefore not necessarily to produce the strongest possible vagal response.
Instead, the clinical goal is to support appropriate autonomic regulation.
Vagus nerve stimulation is being investigated for its potential to influence these responses, and some research suggests that baseline autonomic characteristics may affect treatment outcomes.
However, there is currently insufficient evidence to claim that a particular stimulation protocol can reliably increase vagal tone in one patient and decrease excessive tone in another.
Similarly, heart rate variability can provide useful information about cardiac autonomic regulation, but it cannot independently diagnose the overall functional state of the vagus nerve.
What About a Compressed or Damaged Vagus Nerve?
Not all vagus nerve problems involve altered autonomic signalling alone.
The vagus nerve can also be affected by compression syndromes, structural injury, inflammation, surgery or disease.
Because it travels from the skull base through the neck and chest towards the abdominal organs, pathology affecting different sections of its course may produce different symptoms.
For example, injury affecting vagal pathways involved in the larynx can cause voice changes, while certain neurological injuries can contribute to swallowing difficulties.
The nerve also participates in structures passing through the diaphragm, including the oesophageal hiatus, although this does not mean that ordinary abdominal symptoms establish vagal compression at that site.
Stimulation should not be assumed to correct a mechanical lesion, and improved symptoms do not necessarily indicate that an injured nerve has anatomically healed.
Is It Safe to Stimulate the Vagus Nerve at Home?
This is an important question, particularly given the number of vagus nerve stimulators and electrical devices being marketed online.
Research suggests that appropriately administered auricular stimulation is generally well tolerated.
A major safety review involving 177 studies and more than 6,000 participants found that commonly reported adverse effects included ear discomfort, headache and tingling, without clear evidence of a causal relationship with severe adverse events in the reviewed studies.
Nevertheless, this does not mean that all devices, settings or patients carry the same level of risk.
Considerations include cardiovascular history, fainting episodes, implanted electronic devices, skin integrity, seizure history, medications and the intended stimulation location.
Why I Prefer Auricular Stimulation Over Unsupervised Neck Stimulation
The cervical vagus nerve travels deep within the neck, close to important blood vessels and other structures involved in cardiovascular reflexes.
There are medically designed cervical vagus nerve stimulation devices with specific clinical applications.
However, applying an ordinary TENS unit or improvised electrical stimulator to the neck is not equivalent to using a validated cervical VNS device.
Inappropriate neck stimulation can carry risks, including unwanted cardiovascular effects.
Auricular stimulation offers an attractive alternative because the target sensory fibres are relatively superficial and the published safety evidence is generally reassuring.
Even so, the ear is not automatically safe for every individual, and bilateral stimulation should be selected only after appropriate assessment.
I do not recommend experimenting with improvised electrical vagus nerve stimulation protocols at home without suitable professional guidance.
Do Vagus Nerve Reset Exercises Actually Work?
If you search online for "how to reset the vagus nerve", you will encounter numerous exercises and self-help techniques.
These commonly include slow breathing, meditation, yoga, humming, tongue movements, eye movements and dietary practices such as consuming bitter foods.
Some of these approaches have plausible physiological effects.
For example, slow breathing can influence respiratory sinus arrhythmia and cardiac autonomic regulation, while meditation and yoga may assist with stress management and emotional wellbeing.
However, temporary changes in heart rate or relaxation do not necessarily indicate that an underlying vagus nerve disorder has been corrected.
There is also limited evidence that movements of the eyes or tongue, or consuming bitter foods, can specifically repair or reset the vagus nerve.
For people with complex autonomic disorders, neurological injury or significant symptoms, general relaxation exercises may be insufficient as a standalone strategy.
This does not make them useless. They may still have a supportive role, but their benefits should not be confused with evidence of nerve repair or restoration of autonomic function.
The vagus nerve is not a computer that can simply be reset. It is part of a complex, adaptable physiological network that requires an equally thoughtful approach to assessment and management.
Vagus Nerve Stimulation in Brisbane
At my Brisbane clinic, my interest is in understanding the individual rather than assuming every patient requires the same form of vagus nerve stimulation.
My clinical approach considers the person's symptoms, medical history, cardiovascular and autonomic responses, and factors that may be contributing to dysfunction.
Depending on the individual, therapeutic approaches may include transcutaneous auricular vagus nerve stimulation, auricular needling, vibration-based interventions and photobiomodulation.
Each technique has different proposed mechanisms, research support and safety considerations.
My emphasis is on matching the intervention to the person and monitoring responses rather than pursuing stimulation for its own sake.
Although vagus nerve stimulation is a rapidly developing field, it is important to recognise that many applications remain investigational and should not replace established medical diagnosis and treatment.
Frequently Asked Questions
What is the best way to stimulate the vagus nerve?
There is no single best technique for everyone. Electrical taVNS has a more substantial human research base than auricular vibration or laser-based vagal treatment. The most appropriate approach depends on the clinical indication, contraindications and individual assessment.
Can a TENS machine stimulate the vagus nerve?
Specialised auricular electrode systems can use controlled TENS-type electrical impulses to stimulate regions innervated by the auricular branch of the vagus nerve. This should not be confused with placing ordinary TENS pads over the neck or using unverified settings.
Can vagus nerve stimulation help anxiety or depression?
Research has reported promising findings for some mental health outcomes, particularly depression and anxiety.
Can vagus nerve stimulation help digestive problems?
The vagus nerve has an important role in gut-brain communication. Clinical trials have reported promising improvements in functional dyspepsia with taVNS.
Can vagus nerve stimulation repair nerve damage?
There is interest in the relationship between neural stimulation, plasticity and recovery. However, current clinical research does not establish this ability yet, my clinical experience has shown very promising signs it works.
A More Individualised Approach to Vagus Nerve Treatment
The vagus nerve has extraordinary influence throughout the body, and the development of non-invasive stimulation methods offers an exciting direction for clinical research.
However, the future of vagus nerve treatment is unlikely to be found in stimulating every person in exactly the same way.
It will depend on understanding the underlying problem, identifying appropriate targets, selecting the correct intervention and measuring whether meaningful improvements occur.
For people in Brisbane seeking advice about vagus nerve dysfunction, dysautonomia or the potential role of non-invasive vagus nerve stimulation, individual assessment provides a more informed starting point than simply purchasing a stimulator and experimenting at home.
Emrys Goldsworthy
Bardon Counselling and Natural Therapies | Brisbane, Australia
This article provides general educational information and discusses both established and investigational approaches. It does not constitute individual medical advice or establish that the therapies described are effective for every condition.
Research and Scientific References
Kim AY et al. (2022). Safety of transcutaneous auricular vagus nerve stimulation (taVNS): a systematic review and meta-analysis. Scientific Reports. Read paper
Clinical application of transcutaneous auricular vagus nerve stimulation: a scoping review. (2024). PubMed
Lee B et al. (2025). Transcutaneous auricular vagus nerve stimulation for functional dyspepsia: A systematic review and meta-analysis. Complementary Therapies in Medicine. Read paper
Acupuncture at the auricular branch of the vagus nerve enhances heart rate variability in humans: An exploratory study. PubMed
Donovan KM et al. (2025). Vibrotactile auricular vagus nerve stimulation alters limbic system connectivity in humans: A pilot study. PLOS ONE. Read paper
Pereira RA et al. (2026). Effects of Acute Photobiomodulation on Heart Rate Variability in Physically Active Individuals: A Randomized and Controlled Clinical Trial. Journal of Biophotonics. Read paper
Cardiovascular effects of auricular stimulation: a systematic review and meta-analysis of randomized controlled clinical trials. (2023). PubMed
Schiweck C et al. (2025). The heart knows best: baseline heart rate variability as guide to transcutaneous auricular vagus nerve stimulation in depression. Translational Psychiatry. PubMed
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