The Vagus Nerve, Stress & Digestion: Why Your Gut Often Knows You're Stressed Before You Do

Have you ever gone through a stressful period and suddenly found yourself dealing with bloating, indigestion, constipation, or that "butterflies in your stomach" feeling?

You're not imagining it!

The brain and digestive system are connected- ongoing emotional stress have huge impact on digestive system ability to function!

At the centre of this connection is something called the vagus nerve.

Meet Your Vagus Nerve

The vagus nerve is the most important nerves in the body. Starting in the brainstem and travelling down the neck, connecting with the heart, lungs, stomach, intestines and many other organs on the way!

Think of it as a major communication highway between your brain and your body.

One of its most important jobs is helping regulate the part of your nervous system responsible for rest, digestion, healing and recovery. In other words, when your vagus nerve is functioning well, your body is better able to switch out of survival mode and into a state where it can actually repair, restore and digest food properly.

Stress Can Disrupt Digestion

The human body is incredibly clever.

When we think we are 'in danger', our nervous system automatically shifts into what we call the fight-or-flight response. This is a normal survival mechanism to help keep us safe.

The problem is that our nervous systems doesn't know the difference between a charging tiger and an overflowing inbox!

Whether it's work pressure, financial worries, family stress, lack of sleep, relationship difficulties or simply trying to juggle too much at once, the body can respond in a very similar way.

When we're stuck in this fight-or-flight state, the body prioritises survival over digestion.

Blood flow is redirected away from the digestive organs, stress hormones increase, heart rate rises and digestive processes slow down or become disrupted.

This is often why people notice symptoms such as:

• Bloating

• Reflux

• Constipation

• Diarrhoea

• Nausea

• Abdominal discomfort

• Changes in appetite

It's not "all in your head." It's your nervous system doing exactly what it thinks it needs to do to keep you safe.

What Does Polyvagal Theory Have to Do With It?

You may have heard of Polyvagal Theory, developed by neuroscientist Dr Stephen Porges.

Without getting too technical, the theory suggests that our nervous system is constantly scanning our environment for signs of safety or danger. Depending on what it detects, it changes how our body functions.

When we feel safe and connected, the vagus nerve helps support digestion, recovery, immune function and social engagement.

When we feel threatened or overwhelmed, the body shifts into protection mode.

I find this framework helpful because it explains something many people experience every day: when life feels stressful, our physical health often reflects it.

The body and mind are never operating separately. They're constantly having a conversation.

Where Chiropractic Comes In

This is where chiropractic becomes really interesting.

Many people think chiropractic care is simply about relieving back or neck pain, but modern research is showing that chiropractic may influence much more than muscles and joints.

Dr Heidi Haavik, a chiropractor and neuroscientist, has spent years researching how spinal adjustments affect the brain and nervous system. Her work suggests that adjustments may help improve the way the brain receives and processes information from the body.

When the brain has more accurate information coming from the spine and nervous system, it may be better equipped to adapt to stress and regulate bodily functions effectively.

Now, to be clear, chiropractic care is not a treatment for digestive disorders.

However, what we often see in practice is that as people's nervous systems become more regulated, they frequently report changes beyond their original reason for seeking care. They may sleep better, feel calmer, cope with stress more effectively and sometimes notice improvements in digestive comfort as well.

This makes sense when we remember that every system in the body is ultimately controlled and coordinated by the nervous system.

Supporting Your Nervous System Every Day

While chiropractic care can be one piece of the puzzle, there are many simple ways to support healthy vagus nerve function and help your body shift out of fight-or-flight mode.

Some of my favourites include:

• Slow, deep breathing

• Regular movement

• Spending time outdoors

• Quality sleep

• Meaningful social connection

• Meditation or mindfulness practices

• Singing, humming or gentle breathwork

None of these are magic fixes, but together they send an important message to your nervous system:

You are safe.

And when the nervous system feels safe, the body is often able to function the way it was designed to.

Final Thoughts

If you've been struggling with digestive issues, it can be easy to focus solely on the gut itself.

But sometimes it's worth asking a different question:

What state is my nervous system in?

Our bodies were never designed to live in a constant state of stress. The more we can support nervous system regulation, the more opportunity we create for healing, recovery and healthy digestion.

The vagus nerve sits right at the heart of this connection, reminding us that the brain, body and gut are not separate systems at all—they're all part of the same conversation.

At the Tuning Room we specialise in unique approaches to help test for allergies, intolerances and to help with digestion issues. We also look at the holistic approach for adjusting your body away from FIGHT OR FLIGHT and into the REST AND DIGEST approach.

Book straight in for a consultation to help test your triggers to eliminate them!! https://www.the-tuning-room.co.uk/newpatientservices