June 08, 2026

Do You Really Have IBS? Signs SIBO Could Be Contributing to Your Symptoms

SIBO and IBS recovery online course with Gateway Workshops accredited gut health training UK

Do You Really Have IBS? Signs SIBO Could Be Contributing to Your Symptoms

Many people spend years being told they have IBS while still feeling confused, exhausted and frustrated by ongoing digestive symptoms that never seem to fully improve.

For some people, bloating becomes so normal they begin expecting it every day.

Others avoid social situations, restaurants, holidays or certain foods because they never know how their stomach is going to react.

Some describe looking flat in the morning but feeling heavily bloated by the evening. Others feel uncomfortable after eating foods they once tolerated perfectly well.

Many people are left wondering:

  • “Why do healthy foods suddenly make me bloated?”
  • “Why does my stomach swell after eating?”
  • “Why do I still feel unwell even when tests come back normal?”
  • “Why do I react to everything now?”

For some people, symptoms are eventually labelled as IBS.

But many still feel there may be something deeper contributing underneath the surface.

In recent years, growing awareness around SIBO (Small Intestinal Bacterial Overgrowth) has led increasing numbers of people to begin exploring whether gut imbalance, motility issues, stress, nervous system dysregulation or bacterial overgrowth could potentially be connected to the symptoms they are experiencing.

While not everybody with IBS has SIBO, and not everybody with SIBO experiences the same symptoms, there can sometimes be significant overlap between the two.

This is one reason why so many people are now searching for answers around bloating, constipation, digestive discomfort, food sensitivities and ongoing gut-health struggles.

Explore the SIBO Recovery Plan Course

Contents

What is IBS?

IBS stands for Irritable Bowel Syndrome.

It is a term commonly used to describe a group of digestive symptoms which may include:

  • bloating
  • constipation
  • diarrhoea
  • stomach discomfort
  • excess gas
  • reflux
  • food intolerances
  • changes in bowel habits

For some people, symptoms may come and go.

For others, digestive problems can begin affecting confidence, relationships, energy levels, travel, sleep and overall quality of life.

Symptoms are also often influenced by stress levels, hormone fluctuations, burnout, anxiety, poor sleep and nervous system overload, which is one reason why many people feel trapped in cycles where symptoms improve slightly and then flare again.

Why some people begin looking beyond “just IBS”

Many people with IBS work incredibly hard to improve their symptoms.

They may try:

  • elimination diets
  • supplements
  • probiotics
  • low FODMAP approaches
  • medications
  • healthier eating
  • stress reduction
  • cutting out gluten or dairy

Yet despite their efforts, some people still feel something is not fully resolving underneath.

This is often when people begin researching possible root-cause contributors and discovering information around SIBO.

Learn More About Our Online SIBO Recovery Course

What is SIBO?

SIBO stands for Small Intestinal Bacterial Overgrowth.

It is a condition where bacteria that would normally be found mainly in the large intestine begin growing excessively within the small intestine.

This can sometimes contribute to symptoms such as:

  • bloating after meals
  • excessive gas
  • constipation
  • diarrhoea
  • nausea
  • reflux
  • abdominal discomfort
  • fatigue
  • brain fog
  • food sensitivities
  • nutritional deficiencies

For some people, symptoms appear to worsen after eating fermentable foods or certain carbohydrates.

Others notice symptoms become significantly worse during periods of stress, anxiety or nervous system overload.

Why healthy foods can sometimes feel like they make symptoms worse

One of the most confusing things for many people is reacting badly to foods often considered “healthy.”

This may include foods such as:

  • onions
  • garlic
  • beans
  • lentils
  • broccoli
  • cauliflower
  • apples
  • fermented foods
  • fibre-rich foods

Many people become extremely confused when they are eating what they believe is a very healthy diet yet still feel bloated, uncomfortable or reactive afterwards.

This can lead to fear around food, frustration and anxiety surrounding meals.

The gut and nervous system connection

One area now receiving increasing attention is the relationship between the digestive system and the nervous system.

Many people notice their digestive symptoms become significantly worse during periods of:

  • chronic stress
  • overwhelm
  • anxiety
  • emotional exhaustion
  • burnout
  • poor sleep

The body is designed to digest most effectively when it feels safe and regulated.

When somebody spends long periods stuck in “fight or flight” mode, digestion, motility and overall gut function can sometimes become affected.

This is one reason why digestive symptoms are often not simply “physical.”

For many people, stress and gut symptoms become deeply interconnected.

Discover the SIBO Recovery Plan

Digestive symptoms after antibiotics or illness

Some people notice symptoms begin or worsen after:

  • antibiotics
  • food poisoning
  • stomach bugs
  • periods of high stress
  • burnout
  • hormonal changes

This does not automatically mean SIBO is present, but many people begin exploring possible gut imbalance or microbiome disruption after noticing significant changes following these events.

Why constipation and bloating often keep returning

For some people, especially those with methane-dominant SIBO patterns, slower gut motility and constipation may become an ongoing struggle.

Many people find they can temporarily improve symptoms, only for bloating and constipation to gradually return again later.

This is one reason why many practitioners and gut-health educators now discuss the importance of looking at the bigger picture, including:

  • gut motility
  • nervous system health
  • stress levels
  • food triggers
  • lifestyle factors
  • microbiome balance
  • sleep and recovery

rather than focusing only on symptoms in isolation.

Feeling dismissed or not taken seriously

One of the hardest parts for many people is feeling dismissed, unheard or unsupported while struggling with symptoms daily.

Digestive issues can affect:

  • confidence
  • social life
  • travel
  • intimacy
  • work
  • mental wellbeing
  • energy levels

Many people begin feeling isolated after years of trying different diets, supplements or advice without fully understanding what may be contributing to how they feel.

Sometimes simply discovering there may be possible explanations beyond “it’s just IBS” can help people feel less alone.

There is hope

Every person’s digestive-health journey is different and there is rarely one simple answer that applies to everybody.

However, increasing awareness around gut health, SIBO, stress, nervous system regulation, motility and the gut-brain connection is helping many people begin understanding their symptoms more deeply and compassionately.

For many people, learning more about the possible connections between digestion, lifestyle, stress and gut function can become an important first step towards feeling more empowered and supported.

Learn more about gut health and SIBO

If you would like to explore this topic further, our educational SIBO and Gut Health course discusses:

  • digestive health foundations
  • stress and the nervous system
  • food sensitivities
  • lifestyle support approaches
  • gut-health awareness
  • holistic wellbeing perspectives
  • possible root-cause contributors

Explore the SIBO Recovery Plan Course

You can also read our full SIBO Recovery Plan article here.

Important note

This article is intended for educational purposes only and should not be used as medical advice, diagnosis or treatment guidance.

Anyone experiencing ongoing digestive symptoms should seek appropriate professional medical support.

If you are interested in gut health, nervous system support, stress, wellbeing and holistic recovery approaches, these related Gateway Workshops online courses may also be useful:

Frequently asked questions about IBS and SIBO

Can IBS symptoms be linked to SIBO?

While not everybody with IBS has SIBO, and not everybody with SIBO experiences the same symptoms, there can sometimes be significant overlap between the two.

What is IBS?

IBS stands for Irritable Bowel Syndrome. It is a term commonly used to describe a group of digestive symptoms which may include bloating, constipation, diarrhoea, stomach discomfort, excess gas, reflux, food intolerances and changes in bowel habits.

What is SIBO?

SIBO stands for Small Intestinal Bacterial Overgrowth. It is a condition where bacteria that would normally be found mainly in the large intestine begin growing excessively within the small intestine.

Why do healthy foods sometimes make symptoms worse?

Many people become extremely confused when they are eating what they believe is a very healthy diet yet still feel bloated, uncomfortable or reactive afterwards.

Can stress affect digestive symptoms?

Many people notice their digestive symptoms become significantly worse during periods of chronic stress, overwhelm, anxiety, emotional exhaustion, burnout and poor sleep.

Can antibiotics affect gut symptoms?

Some people notice symptoms begin or worsen after antibiotics, food poisoning, stomach bugs, periods of high stress, burnout or hormonal changes.

Why do constipation and bloating often keep returning?

For some people, especially those with methane-dominant SIBO patterns, slower gut motility and constipation may become an ongoing struggle.

Is this article medical advice?

No. This article is intended for educational purposes only and should not be used as medical advice, diagnosis or treatment guidance.

Last updated: June 2026

 

Written by Sue Bailey