Can Anxiety Cause IBS? Can IBS Cause Anxiety? Why Your Gut and Brain Are Connected
If you've ever felt your stomach drop before a big presentation, or noticed your digestion go haywire during a stressful period — you've felt the gut-brain connection in action. For people living with IBS, bloating, constipation or reflux alongside anxiety, this connection isn't just a curiosity. It's a daily reality that affects everything.
And yes — anxiety can absolutely cause gut symptoms. But it also works the other way. Your gut problems can be driving your anxiety. Both are true at the same time, and that's exactly why so many people stay stuck.
I'm Tammy Footit, clinical hypnotherapist and nutritionist based in Penrith. In my clinic I work with a lot of people who have been bouncing between gut specialists and mental health support for years without resolution — because nobody has treated both systems together. This article explains why that matters, and what a different approach looks like.
The Gut-Brain Axis — Your Internal Communication Highway
The gut and brain are in constant two-way communication through a system called the gut-brain axis. This network includes the vagus nerve — a major nerve running directly between the brain and the gut — as well as hormonal and immune pathways that influence both digestion and mood.
When one part of this system is dysregulated, the effects ripple across the whole body:
Anxiety and chronic stress disrupt gut motility, increase intestinal permeability, alter the gut microbiome and heighten the gut's sensitivity to normal sensations
IBS symptoms — pain, bloating, unpredictable bowel habits — activate the stress response, worsen anxiety and create a feedback loop that's genuinely hard to break
An imbalanced gut microbiome directly affects mood and mental health, because a significant proportion of the body's serotonin is produced in the gut — not the brain
This is why treating only the gut or only the mind so often falls short. Both need to be addressed together.
What's Actually Going On — Getting to the Root
Before diving into treatment, understanding what's actually driving the problem is essential. In my clinic in Penrith I use functional testing to get a clear picture of what's happening beneath the surface.
SIBO — Small Intestinal Bacterial Overgrowth
One of the most commonly missed drivers of IBS-type symptoms is SIBO — an overgrowth of bacteria in the small intestine where they don't belong. SIBO causes bloating, gas, abdominal pain, constipation or diarrhoea, and is frequently misdiagnosed as IBS. What many people don't realise is that SIBO can also drive anxiety — the bacterial overgrowth produces gases and toxins that travel through the gut-brain axis and directly affect mood and nervous system function. A simple breath test can identify whether SIBO is present.
Microba Gut Microbiome Testing
The Microba stool test is one of the most comprehensive gut microbiome analyses available in Australia. It maps the full ecosystem of bacteria, fungi and other microorganisms in your gut, identifying imbalances, low diversity, and specific strains associated with inflammation, poor mood, immune dysregulation and digestive dysfunction. This gives us a precise, personalised picture of what your gut actually needs — rather than guessing.
Together these tests take the guesswork out of gut treatment and allow us to target the root cause specifically.
Why I Start With the Nervous System
Here's something that most gut treatment protocols miss entirely — and it's the thing that has most changed how I work.
Even the best dietary changes and targeted gut protocols will have limited success if the nervous system is in a chronic state of stress and dysregulation. The gut cannot heal properly when the body is stuck in fight or flight. Gut motility, digestive enzyme production, gut lining integrity, and the composition of the microbiome are all directly affected by the state of the nervous system.
This is why in my clinic I often use nervous system regulation as a first line of therapy — before or alongside nutritional and gut-specific treatment. When we calm the nervous system first, everything else works better and faster.
The tool I use for this is clinical hypnotherapy, specifically gut-directed hypnotherapy — a clinically validated, evidence-based approach that works directly on the brain-gut pathway.
Gut-Directed Hypnotherapy — What It Actually Does
Gut-directed hypnotherapy is not relaxation therapy. It is a specific, research-backed clinical approach that has been shown in multiple studies to significantly reduce IBS symptoms — in some cases more effectively than dietary intervention alone.
In sessions we work on:
Calming visceral hypersensitivity — the way IBS sufferers often experience normal gut sensations as painful or threatening
Down-regulating the stress response and supporting vagus nerve tone
Releasing subconscious patterns of anxiety, fear around food and anticipatory stress about symptoms
Retraining the gut-brain pathway to respond in calmer, more measured ways
Addressing the underlying anxiety, belief patterns and emotional triggers that keep the nervous system activated
When the nervous system is regulated and the gut-brain communication is retrained, the gut becomes far more responsive to nutritional and microbiome support. The two approaches work synergistically — each making the other more effective.
The Full Picture — Nutrition and Gut Support
Once the nervous system foundation is in place, nutritional and gut-specific support can work to its full potential. This includes:
Personalised nutrition tailored to your specific symptom picture — not a generic FODMAP elimination that strips out half your diet indefinitely, but a targeted approach that identifies your actual triggers while keeping your diet as broad and nourishing as possible.
Gut microbiome support based on testing — using specific prebiotic foods, fermented foods and targeted probiotics to restore diversity and balance, guided by what your Microba results actually show rather than guessing.
Nutrient repletion — IBS and chronic stress deplete key nutrients including iron, B12, zinc and magnesium, all of which are needed for neurotransmitter production and healthy mood. Addressing these deficiencies is often a missing piece in both gut and anxiety treatment.
SIBO treatment where indicated — specific dietary and supplement protocols to address bacterial overgrowth, followed by microbiome restoration once the overgrowth is cleared.
Breaking the Cycle for Good
IBS and anxiety feed each other. The loop feels impossible to escape because treating one without the other only ever gets you part of the way there.
The approach I use in my Penrith clinic — and with clients online across Australia — addresses both systems together, starting with the nervous system as the foundation, supported by functional testing to understand what's actually going on, and targeted nutrition and gut support to heal the underlying imbalances.
This isn't managing symptoms. It's retraining the gut-brain axis to function the way it was designed to.
Ready to Break the Cycle?
If you've been struggling with IBS, bloating, anxiety or the exhausting combination of both — and you're ready for an approach that actually looks at the whole picture — I'd love to help.
I work with clients in Penrith, Western Sydney and online across Australia.
The first step is a free 15 minute discovery call — no pressure, no commitment, just a conversation to see if this approach is the right fit for you.
Book your free discovery call here
Tammy Footit is a Certified Practising Nutritionist and Clinical Hypnotherapist with a Bachelor of Health Science in Nutrition and Dietetic Medicine, and an Advanced Diploma in Clinical Hypnotherapy. She specialises in gut health, IBS, anxiety and the gut-brain connection.