What Is the Vagus Nerve? Why This ‘Rest and Digest’ Nerve Matters for Stress, Sleep and Wellbeing

The vagus nerve has become one of the biggest talking points in nervous-system health, appearing in conversations about stress, sleep, digestion and recovery. Yet new research suggests more than half of UK adults have never heard of it — and some are not entirely sure where it is. So, what exactly is the vagus nerve, what does it do, and can you really “reset” it?

From breathing exercises and cold-water swimming to humming and wearable technology, interest in the vagus nerve has grown considerably within the wellness world.

But despite its increasing popularity, there appears to be a significant gap between hearing about “vagus nerve regulation” on social media and understanding what this important part of our nervous system actually does.

A survey of 1,000 UK adults, commissioned by neurotechnology company Nurosym, found that 51% had never heard of the vagus nerve before taking part in the research. Fewer than one in four (23%) correctly identified it as a nerve connecting the brain with major organs throughout the body.

Perhaps more surprisingly, 15% chose an explanation associated with sex or female reproductive anatomy when asked what the vagus nerve was.

So, before we start talking about vagus nerve stimulation and nervous-system regulation, it may be worth going back to basics.

What is the vagus nerve?

The vagus nerve is one of the body's longest cranial nerves. It runs from the brainstem through the neck and into the chest and abdomen, carrying signals between the brain and organs including the heart, lungs and digestive system.

It plays an important role in regulating automatic bodily functions such as heart rate and digestion and is a major component of the parasympathetic nervous system — sometimes described as the body's “rest and digest” system.

This branch of the nervous system helps the body regulate physiological activity and return towards a calmer state following periods of stress.

Yet the survey suggests relatively few people understand this role. Just 27% associated the vagus nerve with communication between the brain and internal organs, while only 16% recognised its involvement in heart-rate regulation and 12% connected it with digestion.

Dr Jo Brown, Head of Human Performance at Nurosym, explains:

"There's certainly some confusion between the vagus nerve and female anatomy, although the reality is far more interesting than the name might suggest. The vagus nerve isn't part of the reproductive system, but it is involved in communication between the brain and many of our internal organs, helping regulate functions we rely on every day.

"What's interesting is that some of the more surprising answers aren't necessarily as far-fetched as they sound. The vagus nerve has connections with aspects of sexual physiology, and it's involved in several digestive processes, so the relationship between our nervous system and everyday bodily functions is more complex than many people realise."

Why are people confusing the vagus nerve with the vagina?

Part of the confusion may simply come down to language.

When respondents were asked to describe the vagus nerve, several placed it somewhere within the female reproductive system, while others associated it with sexual pleasure.

When presented with possible definitions, almost one in seven selected answers including “part of the female reproductive anatomy”, “a nerve that controls orgasms”, “a nerve that controls sexual arousal”, “a nerve that controls sex drive” or “a nerve responsible for period cramps”.

Men were more likely to select one of these explanations than women, at 17% compared with 12%.

Some of the responses were particularly memorable. One London respondent described it as "a nerve in your vagina", while someone in Yorkshire suggested it was a "vaginally rash of sorts". Another respondent in the East of England guessed it was "something in the female naughty area!"

While amusing, the answers highlight a wider issue: many of us know surprisingly little about the nervous system quietly regulating numerous functions within our bodies every day.

What does the vagus nerve have to do with stress?

One reason the vagus nerve has attracted so much attention in wellness is its relationship with the parasympathetic nervous system.

When we encounter stress, the effects aren't confined to our thoughts. The body responds too. Heart rate, breathing and digestion can all change as the nervous system responds to what it perceives as a challenge or demand.

Dr Brown explains:

"We tend to think of stress as something that happens in our minds, but the nervous system is constantly coordinating physical responses throughout the body. When we're under pressure, our heart rate may increase, breathing patterns change and digestion can be affected, because the body is adapting to what it perceives as a demand.

"The vagus nerve plays an important role in the communication between the brain and these internal systems, particularly in supporting the parasympathetic response that helps the body regulate itself during rest and recovery. Understanding this connection is important because our ability to recover from everyday stress is not simply about feeling relaxed mentally; it also involves measurable physiological processes."

This connection between the brain and body helps explain why nervous-system regulation has become such an important area of wellbeing research — and why the vagus nerve is increasingly appearing in discussions about stress and recovery.

Can you really “reset” your vagus nerve?

Search social media for the vagus nerve and you are likely to encounter promises of exercises or techniques that can supposedly “reset” it.

Breathing exercises, humming, singing and cold-water exposure are among the practices commonly discussed online in connection with vagal activity.

However, describing this as a “vagus nerve reset” oversimplifies what is happening.

The nervous system does not operate like a computer that can simply be switched off and rebooted. Researchers are instead interested in how vagal signalling can be influenced and what this may mean for the regulation of physiological processes.

The distinction matters, particularly as wellness terminology can sometimes move considerably faster than the science behind it.

Two-thirds (67%) of people surveyed were unsure whether the vagus nerve could actually be “reset”, suggesting there is an opportunity for clearer information about what nervous-system regulation really means.

Can everyday activities affect the vagus nerve?

Interestingly, some of the answers that initially sound unusual aren't necessarily as strange as they appear.

One in six respondents (17%) believed having an orgasm could influence the vagus nerve, while 10% selected having a bowel movement. Another 10% chose kissing someone and 8% falling in love.

The vagus nerve is involved in digestive processes and has connections with aspects of sexual physiology, illustrating just how extensively the nervous system interacts with everyday bodily functions.

It is another reminder that our physical and emotional experiences are not necessarily separate systems. The brain is constantly receiving information from and communicating with the body.

What is vagus nerve stimulation?

Alongside lifestyle practices, scientists are also investigating more targeted methods of influencing vagal activity.

One area of research is non-invasive vagus nerve stimulation, where electrical impulses are used to stimulate branches of the nerve without surgery.

Nurosym, which commissioned the survey, has developed a CE-certified non-invasive neuromodulation wearable using its AVNT™ technology. A small earpiece delivers gentle electrical stimulation through the outer ear, where a branch of the vagus nerve can be accessed.

Unlike a smartwatch or fitness tracker that primarily monitors physiological information, the technology is designed to influence nervous-system activity directly.

According to Nurosym, its technology has been investigated in more than 60 published clinical studies, including placebo-controlled trials examining areas such as nervous-system regulation, stress, fatigue and sleep.

Dr Brown says:

"There is an important difference between the idea of 'resetting' your vagus nerve, as it's often described on social media, and the scientific study of how nerve activity can be influenced. With Nurosym, we're using targeted electrical stimulation delivered through the ear to engage the vagus nerve, and investigating its effects through clinical research.

"As conversations around nervous-system health become more mainstream, it's encouraging to see people taking an interest in how their bodies respond to stress and recover. However, that interest needs to be accompanied by accurate information about what the vagus nerve actually does and what the science can tell us about supporting nervous-system function."

Why the vagus nerve is likely to remain a wellbeing talking point

The survey may have uncovered some entertaining gaps in our anatomical knowledge, but behind the humour is a much more interesting conversation about how the brain and body communicate.

For years, wellbeing has often been discussed in separate categories: mental health, physical health, sleep, digestion, stress and recovery. Our nervous system provides a reminder that these processes are interconnected.

Understanding the vagus nerve does not mean we need to chase every new “nervous-system hack” appearing online. If anything, growing interest makes evidence-based information more important.

The vagus nerve isn't a mysterious wellness switch waiting to be reset. It is an established part of human anatomy involved in the continuous communication between the brain and body.

And perhaps that is more fascinating than any wellness trend.

Survey information: The research was commissioned by Nurosym and conducted through Pollfish among 1,000 UK adults on 26 October 2026.