The Vagus Nerve, Gut, and Vaginal Microbiome

Why digestion, nervous system regulation, and women’s hormonal health are deeply intertwined

Many women don’t realise how closely their nervous system, gut, and vaginal microbiome are connected - or how changes in one system can ripple through the others.

During perimenopause and menopause, declining oestrogen and shifts in the microbiome can lead to vaginal dryness, discomfort, recurrent urinary tract infections (UTIs), digestive changes, and increased anxiety or panic episodes.

Understanding this connection - and learning conscious ways to support the nervous system, gut, and microbiome - can help women navigate these changes with more comfort, confidence, and resilience.

Digestion is not just a matter of “what you eat,” - it's actually heavily regulated by the autonomic nervous system and the Vagus Nerve.

The Vagus Nerve carries signals between the brain and the digestive system, controlling:

• stomach acid production

• digestive enzyme release

• intestinal motility

• gut blood flow

• microbial balance

  
  

Within this system, the Dorsal Vagal Complex plays a primary role in regulating automatic digestive processes, keeping your gut functioning smoothly and efficiently.

When the dorsal vagal circuit is working well, digestion feels effortless, beneficial microbes thrive, and inflammation is kept in check.

When this circuit is dysregulated - due to stress, hormonal shifts, illness, or nervous system overload - digestion can become irregular, bloating or constipation may appear, and gut discomfort can even influence mental health, contributing to anxiety, panic, and brain fog.

Why the gut and vaginal microbiomes are connected

The gut and vaginal microbiomes are biologically linked. Many of the beneficial bacteria that dominate a healthy vaginal environment, particularly Lactobacillus species, originate in the gut and migrate naturally to the vaginal ecosystem.

This connection means:

• Supporting gut bacteria helps stabilise the vaginal microbiome

• Probiotics to support both gut and vaginal microbial balance

• Prebiotic fibres and anti-inflammatory herbs create an environment for these microbes to thrive and regulate pH

  
  

The perimenopause factor: Why anxiety and shutdown are common

During perimenopause, declining oestrogen can lead to:

• reduced vaginal lubrication and thinning tissue

• shifts in vaginal microbial balance

• increased digestive sensitivity

• more reactive nervous system states

Because the dorsal vagal system is closely linked to the gut and microbiome, women may experience a cascade of changes:

• bloating or gut discomfort

• anxiety or panic episodes

• emotional shutdown or withdrawal

• disrupted sleep

• heightened stress responses

Many women feel isolated or scared, simply because these changes are not often discussed in mainstream health conversations.

Supporting the gut microbiome, calming inflammation, and activating the vagal system can significantly ease these symptoms.

How supporting the Dorsal Vagal Circuit can help

1. Probiotics

   • Reintroduce beneficial microbes

   • Improve gut barrier and microbial diversity

   • Indirectly support vaginal microbiome balance

2. Prebiotics and Anti-inflammatory Herbs 

   • Feed beneficial gut bacteria

   • Calm digestive inflammation

   • Support a healthy environment for microbes to flourish

3. Nervous System Regulation

   • Your nervous system doesn’t have to run on autopilot. You can consciously intervene to interrupt inappropriate stress responses and support digestion, microbiome balance, and emotional wellbeing.

     For example, before meals, you might:

     • Take 3 slow, deep breaths, exhaling slightly longer than you inhale

     • Focus your attention on the breath and body sensations

     • Engage in gentle movement, grounding, or mindful pauses

     • Discover the predictable and organised way in which your autonomic nervous system has learnt to manage stress - and change it if it's not working for you!

       
       

     When we consciously activate the parasympathetic nervous system, the body’s “rest and digest” mode - we are helping improve digestion, calm anxiety, and create a more supportive environment for the microbiome.

     
     

When these elements are combined, digestion, microbiome balance, and mental wellbeing can all improve together.

The big picture

Your body is an interconnected ecosystem. Changes in one system - like declining oestrogen during perimenopause - can ripple through digestion, microbial balance, and mental health.

By understanding and supporting the dorsal vagal circuit, gut microbiome, and vaginal microbiome, you can:

• Reduce anxiety and panic related to digestive or hormonal shifts

• Support smoother digestion and less bloating

• Maintain healthier vaginal ecosystems

• Navigate perimenopause and menopause with more comfort, clarity, and confidence.