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The Important Role of Your Vagus Nerve

Updated: May 23, 2019

by Dr. Phil Smith

Chiropractic care is a powerful way to boost your ability to heal. Most of us have heard that stress can cause havoc on the mind and body. We all have stress. Those who are not dealing with the stress properly are the ones that will suffer health problems. It is your response to stress that matters the most- how do you physically and mentally adapt/handle the stress. For those of you already under regular chiropractic care, you have likely noticed overall health improvements including your ability to relax, sleep, be in a better mood and so on.

Spinal posture affects and moderates every physiological function from breathing to heart beat regulation, blood, pressure, hormone function, digestion etc. Your ability to make new cells, recharge, re-generate, digest food is regulated in large part by the Vagus nerve (at the top of your neck- see poster above).

Chiropractic adjustments have been shown to improve how your Vagus nerve works. That is why people with different conditions like high blood pressure, blood sugar, digestion, breathing, hormone problems etc. improve with chiropractic care. Commonly under our 5 Fundamental program people will no longer need medications and will reverse their condition(s).

You can stimulate the Vagus nerve and boost your healing power at home with these 30 self-help remedies found at the bottom of this article by Joel Cohen, adapted from

What is the Vagus Nerve?

by Joel Cohen, BS

In people with fatigue, food sensitivities, anxiety, gut problems, brain fog and depersonalization, the vagus nerve is almost always at play. These people have lower vagal tone, which means a lower ability to perform its functions.

The only question is which aspect of the vagus nerve is malfunctioning and to what extent it is the problem vs. other aspects of your biology.

The vagus nerve is part of the parasympathetic nervous system, referred to as the rest-and-digest system. It’s not the only nerve in the parasympathetic system, but it’s by far the most important one because it has the most far-reaching effects.

The word vagus means “wanderer,” because it wanders all over the body to various important organs.

The vagus nerve reaches the brain, gut (intestines, stomach), heart, liver, pancreas, gallbladder, kidney, ureter, spleen, lungs, reproductive organs (female), neck (pharynx, larynx, and esophagus), ears, and tongue.

Given the importance of the vagus nerve to the gut (and other organs), when it’s not working properly, it will cause digestive disorders including dyspepsia, gastroparesis, GERD, ulcerative colitis, anorexia, and bulimia, to name a few.

Vagus Nerve Functions


In the brain, the vagus nerve helps mood and controls anxiety and depression.

The vagus nerve is largely responsible for the mind-body connection since it goes to all the major organs (except the adrenal and thyroid glands).

It’s intimately tied to how we connect with one another — it links directly to nerves that tune our ears to human speech, coordinate eye contact, and regulate emotional expressions. It influences the release of oxytocin, a hormone that is important in social bonding [1].

Studies have found that higher vagal tone is associated with greater closeness to others and more altruistic behavior [2].

Vagus activity of a child can be affected by their mother. Infants had lower vagus activity with mothers who were depressed, angry, or anxious during pregnancy [3].

Some studies suggested that the vagus nerve is important for getting in the mental state of “flow”. It’s believed that the combination of sympathetic (fight-or-flight) and vagus activation creates the right environment for a flow state [1].

Vagus nerve stimulation might increase wakefulness (by increasing orexin in the prefrontal cortex). It has been shown to decrease the amounts of daytime sleep and rapid eye movement in epilepsy patients with traumatic brain injury and also promoted the recovery of consciousness in comatose rats after traumatic brain injury  [4].

However, the vagus nerve also might cause ‘sickness behavior’ (fatigue, sleepiness, depression, anxiety, appetite loss, pain, lowered motivation, and failure to concentrate) in an inflammatory state (IL-1b) [5].


In the gut, it increases stomach acidity, digestive juice secretion, and gut flow. Since the vagus nerve is important for increasing gut flow (motility), having less vagus activation will increase your IBS risk, which is a result of slower flow [6].

Stimulating the vagus nerve increases the release of histamine by stomach cells, which helps release stomach acid [7]. So, low stomach acidity is usually, in part, a vagus nerve problem. By releasing intrinsic factor, the vagus nerve is important to help you absorb vitamin B12.

Satiety and relaxation following a meal are in part caused by activation of the vagus nerve’s transmission to the brain in response to food intake [8].

The vagus nerve is important in conditions like GERD, not only because it controls stomach acidity, but also because it controls the esophagus.


In the heart, it controls heart rate and blood pressure. Vagus activation will lower the risk of heart disease, among other lethal diseases [9].

Liver, Pancreas, and Gallbladder

In the liver and pancreas, it helps control blood glucose balance.

In the gallbladder, it helps release bile, which can help you get rid of toxins and break down fat.

Kidney and Bladder

The vagus nerve promotes general kidney function. It helps with glucose control and increases blood flow [10], which improves blood filtration. Vagus activation also releases dopamine in the kidneys, which helps excrete sodium [11] and, thereby, lower blood pressure.

The vagus nerve also goes to the bladder [12] A side effect of its stimulation is urinary retention [13], which means that less vagus stimulation can cause you to urinate frequently. Indeed, many of my clients complain about frequent urination (also due to low vasopressin, low aldosterone, and high cortisol).


In the spleen, it can reduce inflammation. Note that vagus activation will reduce inflammation in all target organs (by releasing acetylcholine), but when it activates in the spleen the response will probably be more systemic [14].

It helps control fertility and orgasms in women by connecting to the cervix, uterus, and vagina. Women can actually experience orgasms simply from the vagus nerve.

Mouth and Ears

In the tongue, it helps control taste and saliva; while in the eyes, it helps release tears.

The vagus nerve explains why a person may cough when tickled on the ear, such as when trying to remove ear wax with a cotton swab.

Vagus nerve stimulation helps people with tinnitus because of its connection to the ear.

Potential Symptoms of Vagus Nerve Dysfunction

  • Obesity and weight gain [15].

  • Brain problems

  • DepressionAnxiety

  • High or low heart rate

  • Difficulty swallowing

  • Gastroparesis, also known as delayed gastric emptying

  • Heartburn

  • Dizziness/fainting

  • B12 deficiency

  • Chronic inflammation

Disorders That Vagus Nerve Activation Can Help

Since the vagus nerve is associated with many different functions and brain regions, research shows the positive effects of vagal stimulation on a variety of conditions, including but not limited to:

  • Anxiety DisordersHeart disease

  • OCD

  • Alzheimer’s

  • Fibromyalgia

  • Obesity

  • Tinnitus

  • Alcohol addiction

  • Autism

  • Bulimia

  • Chronic heart failure

  • Memory disorders

  • Mood disorders

  • Bad blood circulation [1].

  • Severe mental diseases

30 Ways to Stimulate the Vagus Nerve

1) Cold

Studies show that when your body adjusts to cold, your fight-or-flight (sympathetic) system declines and your rest-and-digest (parasympathetic) system increases, which is mediated by the vagus nerve [17].

Any kind of acute cold exposure will increase vagus nerve activation [18].

You can dip your face in cold water to start. I’ve graduated and now take fully cold showers, expose myself to cold, and drink cold water.

2) Singing or Chanting

Singing increases Heart Rate Variability (HRV) [1].

Humming, mantra chanting, hymn singing, and upbeat energetic singing all increase HRV in slightly different ways [1]. I do Om chanting in my infrared sauna.

Singing initiates the work of a vagal pump, sending relaxing waves through the choir [1].

Singing at the top of your lungs works the muscles in the back of the throat to activate the vagus.

Energetic singing activates both your sympathetic nervous system and vagus nerve, which helps to get into a flow state [1].

Singing in unison, which is often done in churches and synagogues, also increases HRV and vagus function [1].

Singing has been found to increase oxytocin [19].

3) Yoga

Yoga increases vagus nerve and parasympathetic system activity in general [2021].

A 12-week yoga intervention was associated with greater improvements in mood and anxiety than a control group who did walking exercises. The study found increased thalamic GABA levels, which are associated with improved mood and decreased anxiety [20].

There are two types of meditation that can stimulate the vagus nerve.

Loving-kindness meditation increases vagal tone, as measured by heart rate variability.

Also, Om chanting stimulates the vagus nerve [22].

5) Positive Social Relationships

In a study, participants were instructed to sit and think compassionately about others by silently repeating phrases like “May you feel safe, may you feel happy, may you feel healthy, may you live with ease,” and keep returning to these thoughts when their minds wandered.

Compared to the controls, the meditators showed an overall increase in positive emotions, like joy, interest, amusement, serenity, and hope after the class. These emotional and psychological changes were correlated with a greater sense of connectedness to others and to an improvement in vagal function, as seen by heart-rate variability.

Simply meditating, however, didn’t always result in a more toned vagus nerve. The change only occurred in meditators who became happier and felt more socially connected. Those who meditated just as much but didn’t report feeling any closer to others showed no change in the tone of the vagus nerve.

6) Breathe Deeply and Slowly

Deep and slow breathing stimulates the vagus nerve.

Your heart and neck contain neurons that have receptors called “baroreceptors.”

These specialized neurons detect your blood pressure and transmit the neuronal signal to your brain (NTS), which goes on to activate your vagus nerve that connects to your heart to lower blood pressure and heart rate. The result is a lower fight-or-flight activation (sympathetic) and more rest-and-digest (parasympathetic).

Baroreceptors can be variably sensitive. The more sensitive they are, the more likely they are going to fire and tell your brain that the blood pressure is too high and it’s time to activate the vagus nerve to lower it.

Slow breathing, with a roughly equal amount of time breathing in and out, increases the sensitivity of baroreceptors and vagal activation, which lowers blood pressure and reduces anxiety by reducing your sympathetic nervous system and increasing your parasympathetic system [23].

For an average adult, breathing around 5-6 breaths per minute can be very helpful.

Tip: You need to breathe from your belly and slowly. That means when you breathe in, your belly should expand or go out. When you breathe out your belly should cave in. The more your belly expands and the more it caves in, the deeper you’re breathing.

7) Laughter

As the saying goes, laughter is the best medicine. Many studies show the health benefits of laughing [24].

It seems like laughter is capable of stimulating the vagus nerve.

A study done on yoga laughter found increased HRV (heart rate variability) in the laughter group [25].

There are various case reports of people fainting from laughter, which may be from the vagus nerve/parasympathetic system being stimulated too much.

For example, fainting can come after laughter, urination, coughing, swallowing, or bowel movements, all of which are helped along by vagus activation [26].

There are case reports of people passing out from laughter who have a rare syndrome (Angelman’s) that’s associated with increased vagus stimulation [27, 28].

Laughter is also sometimes a side effect of vagus nerve stimulation [13].

A good bout of laughter is good for cognitive function and protects against heart disease [24]. It also increases beta-endorphins and nitric oxide and benefits the vascular system [29].

8) Prayer

Studies have shown that reciting the rosary prayer increases vagus activation. Specifically, it enhances cardiovascular rhythms such as diastolic blood pressure and HRV [30].

Studies also found that the reading of one cycle of the rosary takes approximately 10 seconds and thus causes readers to breathe at 10-second intervals (includes both in and out breath), which increases HRV and therefore vagus function [1].


Magnetic fields are capable of stimulating the vagus nerve. Studies have found that PEMF can increase heart rate variability and increase vagus stimulation [31].

I use a pulsed magnetic stimulator called ICES in my gut and brain, which stimulates my vagus nerve increasing my appetite and stimulating me.

I recommend using this in your gut, brain, and side of your neck. My gut flow increases and inflammation is reduced everywhere when I put this on my gut.

At first, I didn’t understand how it can have systemic effects if I placed it on my gut, but the vagus nerve must be the main reason given that it’s stimulated by magnets.

10) Breathing Exercises

Breathing in and out with resistance will likely stimulate your vagus nerve better –kind of like jogging with a backpack.

A breathing exercise is to breathe out as hard as you can until it’s really uncomfortable and until you notice how awake you are. I haven’t seen studies on this, but I suspect it will help with your vagus nerve.

11) Probiotics

The gut nervous system connects to the brain through the vagus nerve. There is increasing evidence pointing to an effect of the gut microbiota on the brain.

Animals supplemented with the probiotic Lactobacillus rhamnosus experienced various positive changes in GABA receptors mediated by the vagus nerve [32].

Mild exercise stimulates gut flow. This is mediated by the vagus nerve, which means that exercise also stimulates it [6].

13) Massage

Massaging certain areas like your carotid sinus (located on your neck) can stimulate the vagus nerve. This helps reduce seizures [33].

A pressure massage can activate the vagus nerve. These massages help infants gain weight by stimulating gut function and this is largely mediated by vagus nerve activation [34, 35].

Foot massages can also increase vagal activity and heart rate variability, while lower your heart rate and blood pressure [36]. All of these decrease heart disease risk.

14) Fasting

Intermittent fasting and reducing calories both increase high-frequency heart rate variability in animals [37], which is a marker of vagal tone.

Indeed, many anecdotal reports show that intermittent fasting benefits heart rate variability.

When you fast, part of the decrease in metabolism is mediated by the vagus nerve.

Specifically, the vagus detects a decline in blood glucose and a decrease of mechanical and chemical stimuli from the gut. This increases the vagus impulses from the liver to the brain (NTS), which slows the metabolic rate [38].

Hormones such as NPY increase while CCK and CRH decrease during fasting [38].

When we eat, the opposite happens. Satiety-related stimulatory signals from the gut contribute to increased sympathetic activity and stress-responsiveness (higher CRH, CCK, and lower NPY) [38].

Fasting can increase the activity in the subdiaphragmatic vagus, which can increase an unfavorable sensitivity to pain in animals [39].

The vagus nerve may make you more sensitive to estrogen. In female rats, fasting increases the number of estrogen receptors in certain parts of the brain (NTS and PVN) by the vagus nerve [40].

15) Sleep or Lay on Your Right Side

Studies have found that laying on your right side increases heart rate variability and vagal activation more than being on other sides. Laying on your back leads to the lowest vagus activation [41].

Have trouble falling asleep or staying asleep? Check out my book, Biohacking Insomnia so you can finally go to sleep quickly at night and wake up feeling refreshed.

16) Tai Chi

Tai chi increases heart rate variability and, therefore, very likely vagus activation [42].

17) Gargling

The vagus nerve activates the muscles in the back of the throat that allow you to gargle.

Gargling contracts these muscles, which activates the vagus nerve and stimulates the gastrointestinal tract.

Before you swallow water, gargle it first.

18) Seafood (EPA and DHA)

I’m a big proponent of fish in the lectin avoidance diet.

EPA and DHA increase heart rate variability and lower heart rate [43]. This indicates that they stimulate the vagus nerve.

I’ve taken ten pills of fish oil as a megadosing experiment and my heart rate went from 60 to 40. So, in my self-experiments, fish oil does indeed lower heart rate, which is probably mediated, in part, by the vagus nerve.

19) Oxytocin

Oxytocin increases vagal nerve activity from the brain to the gut (in the brain and orally ingested) [44], which induces relaxation and decreases appetite.

Mice who had their vagus taken out didn’t exhibit the appetite-reducing effects of oxytocin [44].

20) Zinc

Zinc increases vagus stimulation in rats fed a zinc-deficient diet for 3 days [45]. It’s a very common mineral that most people don’t get enough of.

21) Tongue Depressors 

Tongue depressors stimulate the gag reflex.

Some say that gag reflexes are like doing push-ups for the vagus nerve while gargling and singing loudly are like doing sprints.

Traditional acupuncture points stimulate the vagus nerve [46].

In particular, acupuncture to the ear stimulates the vagus nerve [47].

Acupuncture is powerful enough that a man died after vagus nerve stimulation from too low of a heart rate [48].

23) 5-HTP (Serotonin)

Serotonin is capable of activating the vagus nerve through various receptors (5HT1A [49], 5-HT2 [50], 5-HT3, 5-HT4 [51], 5-HT6 [52]). On the other hand, 5-HT7 receptors reduce vagus activation [53, 54].

So, serotonin has some mixed effects, but overall it should stimulate the vagus nerve. You can take 5-HTP to increase serotonin.

24) Chew Gum (CCK)

CCK directly activates vagal impulses in the brain [55].

CCK ability to reduce food intake and appetite is dependent on the vagus nerve impulse to and from the brain [56].

Chewing gum helps increase CCK release.

25) Eat Fiber (GLP-1)

GLP-1 is a satiating hormone that stimulates vagus impulses to the brain, which acts to slow the emptying of your stomach and make you feel fuller [57].

Fiber is a good way to increase GLP-1 [58].

26) Coffee Enemas

Expanding the bowel increases vagus nerve activation, as is done with enemas.

27) Coughing or Tensing the Stomach Muscles

When you bear down as if to make a bowel movement, you stimulate your vagus nerve. That’s why you might feel relaxed after a bowel movement.

So if you use the bowel movement muscles, it will stimulate your vagus nerve.

28) Thyroid Hormones

In rats, the thyroid hormones (T3) increased appetite through activating the vagus nerve [59].

29) Sun (MSH)

Alpha-MSH prevents damage from a stroke in rats via activating the vagus nerve, which suppresses inflammation [60, 61].

Alpha-MSH injection in the brain (DMV) moderately excites the vagus nerve in some conditions [62].

30) Alpha GPC (Acetylcholine)

 While I haven’t seen any studies that it stimulates the vagus nerve itself, Acetylcholine is the main vagal neurotransmitter. This means that it will have many of the effects of vagal stimulation because this is how the vagus nerve stimulates various organs.

Acetylcholine significantly decreases the release of cytokines such as TNF, IL-1b, IL-6, and IL-18 in stimulated human immune cultures [63].

Alpha GPC is a good way to increase acetylcholine. However, I don’t know if it will get to where it needs to go and in the proper dosage.

What Inhibits the Vagus Nerve

1) Carbohydrates (insulin)

Insulin suppresses the vagus nerve from stimulating the liver, which causes increased inflammation in the liver [64].

2) Capsaicin

Capsaicin is the most potent way to inhibit the vagus nerve.

Ginger prevents nausea and vomiting by inhibiting the vagus nerve serotonin function in the digestive tract [65, 66].

The Vagus Nerve and Hormones

Vagus nerve stimulation normalizes an overactive nervous system (HPA axis) [67].

The vagus nerve can help reduce pain, and this is the mechanism by which estradiol reduces pain in certain circumstances [68].

Ghrelin increases hunger by stimulating the vagus nerve signal from the brain to the gut, and this is abolished by capsaicin (in chili) [69].

Besides influencing the release of oxytocin [1], the vagus nerve is important for releasing testosterone. If it’s not working well, it could be the cause of low testosterone.

Testosterone can make people more aggressive, but this is not the case when the vagus nerve is functioning right [70].

Proper functioning of the vagus nerve is important for the production of GHRH (growth hormone releasing hormone) and IGF-1 [71].

The vagus nerve can stimulate other hormones such as parathyroid hormone [72], which is important for the conversion of vitamin D3 to active vitamin D (1,25).

Stimulation of the vagus nerve also produces the release of the vasoactive intestinal peptide (VIP) [73], which is often low in people with CIRS/mold conditions.

NPY blocks some of the vagus nerve effects. NPY is an anti-anxiety and hunger increasing hormone, which prevents heart rate decrease from vagal stimulation [74].


Orexin neurons are found in centers which control vagus nerve activation from the brain (NTS, DMV, and the area postrema) [75].

Orexin stimulates the vagus nerve from the brain, which promotes gut flow.

Orexin A can stimulate the pancreas from the brain [76].

Orexin is capable of increasing glucose tolerance or insulin sensitivity via the liver vagus nerve [77].

On the other hand, orexin is capable of inhibiting the activation of the vagus nerve signals to the brain by competing with CCK [78].


Ghrelin increases growth hormone and hunger by stimulating the vagus nerve signal from the brain to the gut, and this is abolished by capsaicin (in chili) [69].

Ghrelin stimulates the pancreas from the brain via the vagus [79].


Vagal impulses to the brain are activated by leptin. Leptin potentiates the CCK-induced activation of the vagus nerve [80].

Animals bred to be leptin resistant were hungrier since the vagus nerve became less sensitive to CCK [81].

However, another study found that leptin effect on the vagus signal to the brain doesn’t play a major role in food intake [82].


CRH has variable effects on the vagus nerve. It decreases its activity from the brain to the heart. Vagus nerve activation will slow the heart rate, but CRH inhibits this and increases heart rate [83].

CRH stimulates the vagus impulse from the brain (area postrema) to the colon (by activating the dorsal nucleus of vagi, via cholinergic transmission) [84].


Monosodium Glutamate or MSG increases gut flow in dogs, which is mediated by the vagus nerve [85].

Don’t forget our free audio course containing everything you need to know about the vagus nerve.

How Does the Vagus Nerve Malfunction?

Your vagus nerve system can be messed up in 3 main ways:

  • Communication from an organ to the brain

  • Communication within the brain

  • Communication from the brain to other areas of the body like the heart, liver, and gut.

Genetics/Testing for Vagus Activity

You can upload your genetic data to SelfDecode, and see if you have the version of the gene associated with low activity.

Vagus Nerve Terms

You can stimulate or inhibit the vagus nerve in two ways. First, the vagus nerve impulse (activation) can flow from the brain to the rest of the body or from the body to the brain.

When it flows from the brain it’s called a “vagal efferent.” When it flows from other parts of the body to the brain, it’s called a “vagal afferent.” I don’t use these terms for simplicity.

The high-frequency heart rate variability (HRV) is associated with vagus nerve/parasympathetic activity [86, 87].

The low-frequency HRV is associated with both sympathetic (fight or flight) and parasympathetic (rest and digest) activation.

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