SIBO Symptoms, IBS, Bloating and Gut Brain Health in Ireland: When to Consider Testing and Expert Help
Claire Russell is a Registered Nutritionist, Clinical Medical Hypnotherapist, Clinical Hypnotherapist, Counsellor, Psychotherapist and Advanced RTT practitioner with over 20 years of clinical experience. At CounsellingExperts.ie, Claire works with adults, teenagers and children ONLINE across Ireland and internationally, and in person in Adare, Newcastle West, Limerick, Abbeyfeale, Charleville, Kanturk, Midleton, Youghal, Cork, Lismore, Dungarvan and Dublin.
If your stomach feels swollen after small meals, your bowels swing between constipation and diarrhoea, or your brain feels foggy after eating, it can be exhausting. You may have tried cutting out foods, eating “better”, taking probiotics or following general gut advice, yet still feel uncomfortable, anxious about meals, tired and unsure what your body is trying to tell you.
One possible factor to discuss with your GP, gastroenterologist or qualified gut health practitioner is small intestinal bacterial overgrowth, usually called SIBO. SIBO means that bacteria are present in higher amounts than expected in the small intestine, the part of the digestive tract where much of your nutrient absorption takes place.
This article explains what SIBO is, when testing may be worth discussing, how it overlaps with irritable bowel syndrome, known as IBS, and why a whole-person approach may be helpful when gut symptoms are linked with stress, sleep, anxiety, ADHD, hormonal changes, autoimmune symptoms, food cravings or low mood.
Summary
SIBO may be worth discussing with a healthcare professional if you have persistent bloating, excess gas, abdominal discomfort, constipation, diarrhoea, food reactions, fatigue or brain fog.
It can overlap with IBS, gut motility problems, inflammatory bowel disease, hypothyroidism, diabetes, previous abdominal surgery, low vitamin B12, low iron, rosacea and long-term digestive symptoms.
Testing is usually done through a hydrogen and methane breath test, but results need careful interpretation.
Claire Russell Therapy and CounsellingExperts.ie offer Registered Nutritionist services, Counselling, Psychotherapy, Couples Counselling, Marriage Counselling, Clinical Medical Hypnotherapy, Clinical Hypnotherapy, Hypnotherapy and Hypnosis for addictions, trauma-related difficulties, RTT, gut brain axis issues, stress, anxiety and food-related patterns.
This article is educational and does not replace medical advice, diagnosis or treatment. Always speak with your GP, consultant, pharmacist or registered healthcare professional about persistent digestive symptoms, unexplained weight loss, blood in the stool, anaemia, fever, severe pain or sudden changes in bowel habits.
What is SIBO?
Small intestinal bacterial overgrowth is a digestive condition where bacteria accumulate in the small intestine in a way that can interfere with normal digestion. The small intestine is designed for the breakdown and absorption of nutrients. When bacterial fermentation happens too early in the digestive process, it can produce gases and digestive symptoms.
The most commonly discussed gases are hydrogen and methane. Hydrogen is often linked with bloating, gas and diarrhoea-type patterns. Methane is increasingly discussed in relation to constipation and slower gut movement. Some practitioners may also consider hydrogen sulphide patterns, although testing and interpretation can be more complex.
SIBO is not something to self-diagnose. Many of its symptoms overlap with IBS, coeliac disease, inflammatory bowel disease, endometriosis, gallbladder problems, pancreatic issues, food allergy, lactose intolerance, thyroid imbalance, medication effects, stress physiology and eating pattern changes.
That is why good assessment matters.
Common SIBO symptoms to take seriously
Digestive symptoms are common, but patterns can give clues. Consider speaking with a qualified healthcare professional if you notice several of the following symptoms.
1. Persistent bloating after meals
This is one of the most common reasons people begin asking about SIBO. The bloating may feel out of proportion to the amount eaten. Some people describe looking several months pregnant by evening, despite eating ordinary portions.
Bloating can have many causes, including constipation, IBS, swallowing air, food intolerance, hormonal shifts, pelvic issues and stress-related gut changes. SIBO is one possible explanation, not the only one.
2. Excess wind, belching or abdominal pressure
Bacterial fermentation can increase gas production. This may feel like trapped wind, pressure under the ribs, abdominal gurgling, frequent belching or flatulence.
Some people feel embarrassed by these symptoms and start avoiding work lunches, social meals, dates, travel or family occasions. This can gradually affect confidence, relationships and mood.
3. Constipation, diarrhoea or alternating bowel habits
SIBO may be associated with diarrhoea, constipation or a mixed pattern. Methane-dominant patterns are often discussed in relation to constipation, while hydrogen-dominant patterns are more often linked with loose stools. These patterns are not absolute.
If constipation is persistent, painful or linked with bloating, incomplete emptying, nausea or reduced appetite, it is worth seeking proper assessment.
4. Food reactions that seem to keep increasing
Some people begin by reacting to one food, then another, until the diet becomes very restricted. Foods high in fermentable carbohydrates, often called FODMAPs, may trigger symptoms in some people. FODMAPs are short-chain carbohydrates that can ferment in the gut.
A low FODMAP diet may help some people with IBS symptoms, but it should not become a long-term unsupervised restriction. Over-restriction can reduce dietary variety, fibre intake, nutrient intake and confidence around food.
5. Fatigue, brain fog and low concentration
The gut and brain communicate through nerves, immune signals, hormones, microbial metabolites and stress pathways. This is called the gut brain axis. When digestion is unsettled, sleep is poor, food intake is restricted or inflammation is present, you may feel tired, foggy or emotionally more reactive.
For adults, teenagers and children with ADHD, autism spectrum traits, anxiety, OCD patterns or high stress levels, digestive discomfort can also increase sensory overload, irritability, appetite changes and difficulty concentrating.
6. Nutrient deficiencies despite trying to eat well
The small intestine is central to nutrient absorption. In some cases, SIBO may be linked with low vitamin B12, iron issues, fat malabsorption or changes in fat-soluble vitamins such as vitamins A, D, E and K.
Nutrient deficiencies can affect energy, mood, hair, skin, concentration, immunity, hormones, fertility and menstrual health. Blood testing through your GP or appropriate clinician can be important, especially if you have fatigue, dizziness, mouth ulcers, restless legs, heavy periods, low mood or tingling sensations.
7. Symptoms that worsen with probiotics or fermented foods
Probiotics and fermented foods can be helpful for some people, but not for everyone. If your bloating, pain, gas or bowel changes worsen when you take probiotics, kombucha, kefir, sauerkraut or other fermented foods, it does not mean you have SIBO, but it may be a useful clue to discuss.
When SIBO testing may be worth discussing
Testing may be more relevant when symptoms are persistent, unexplained or linked with risk factors.
IBS and ongoing bloating
IBS is a disorder of gut brain interaction. This means the bowel, brain, nervous system and stress physiology can become more sensitive and reactive. IBS can involve abdominal pain, bloating, diarrhoea, constipation or alternating bowel habits.
SIBO and IBS can overlap. Some people with IBS-type symptoms test positive for SIBO, although research findings vary depending on the type of breath test used and how the test is interpreted.
Previous abdominal surgery
Surgery can sometimes alter gut movement, anatomy or the way contents move through the small intestine. This can increase the chance of bacterial overgrowth in some people.
Inflammatory bowel disease in remission
People with Crohn’s disease or ulcerative colitis can have ongoing bloating, pain or bowel changes even when inflammation appears controlled. SIBO may be one possible contributor, especially after surgery or with strictures, but specialist medical guidance is essential.
Hypothyroidism, diabetes or systemic sclerosis
Conditions that affect gut motility, meaning how well the gut moves food along, may increase SIBO risk. This can include hypothyroidism, diabetes-related nerve changes and systemic sclerosis.
Long-term acid suppression, opioids or repeated antibiotics
Proton pump inhibitors, often called PPIs, reduce stomach acid. Opioid medication can slow gut motility. Repeated antibiotic use may alter the gut environment. Never stop prescribed medication without speaking with your doctor or pharmacist, but do mention medication history during assessment.
Rosacea and skin flare patterns
Some research has explored links between SIBO and rosacea. Skin symptoms have many causes, including hormones, immune factors, skincare reactions, food triggers, alcohol, stress and gut issues. If rosacea appears alongside persistent bloating or bowel changes, it may be worth raising the gut connection with a qualified clinician.
How SIBO testing usually works
The most common non-invasive test is a hydrogen and methane breath test. You drink a measured sugar solution, often lactulose or glucose, and breath samples are collected over a set time. The test measures gases produced by microbes and exhaled through the lungs.
Preparation matters. Your clinician or laboratory may give instructions about foods, fasting, supplements, medication timing and antibiotics before testing. Poor preparation can affect results.
Breath tests are useful, but not perfect. False positives and false negatives can happen. A result should always be interpreted alongside your medical history, symptoms, bowel pattern, medication use and other investigations.
Red flags that need medical attention
Please speak with your GP promptly if you have:
Unexplained weight loss.
Blood in your stool or black stools.
Ongoing vomiting.
Fever.
Severe or worsening abdominal pain.
New bowel changes after age 50.
Iron deficiency anaemia.
Difficulty swallowing.
A strong family history of bowel cancer, coeliac disease or inflammatory bowel disease.
Night-time diarrhoea that wakes you.
These symptoms do not automatically mean something serious, but they should not be ignored.
A whole-person approach to SIBO, IBS and gut symptoms
Gut symptoms rarely exist in isolation. In clinic, they often overlap with stress, trauma-related difficulties, sleep disruption, anxiety, low mood, perfectionism, burnout, ADHD, OCD, autism spectrum traits, food fear, binge eating, sugar cravings, hormonal symptoms, perimenopause, PMS, PMDD, PCOS, thyroid issues, fertility concerns, chronic pain, fatigue, skin issues and autoimmune conditions such as coeliac disease, Hashimoto’s thyroiditis, rheumatoid arthritis and psoriasis.
A whole-person clinical plan may consider:
Food intake and meal timing.
Protein, fibre and nutrient adequacy.
Constipation and gut motility.
Stress physiology and the nervous system.
Sleep quality and energy.
Hormonal patterns.
Medication history.
Past infections or antibiotic use.
Food fear, emotional eating or restriction.
Relationships, work pressure and emotional safety.
Addictions, including alcohol, smoking, vaping, gambling, drug use, porn or sex-related compulsive patterns.
This is where Claire’s combined background in Registered Nutritionist services, Counselling, Psychotherapy, Couples Counselling, Marriage Counselling, Clinical Medical Hypnotherapy, Clinical Hypnotherapy, Hypnotherapy and Hypnosis for addictions, trauma-related difficulties and RTT can be helpful. The aim is not to reduce everything to food. The aim is to understand the wider pattern and build a plan that is practical, safe and sustainable.
What you can do before your appointment
1. Keep a simple symptom record
For one to two weeks, write down meals, bowel habits, bloating, pain, stress, sleep, menstrual cycle phase if relevant, medication and supplements. Keep it simple. Patterns matter more than perfection.
2. Do not cut out more and more foods without guidance
Restriction can feel like control at first, but it may lead to fear around eating, low nutrient intake and more sensitivity. If you are already down to a narrow list of foods, seek professional help.
3. Ask about appropriate testing
Depending on your symptoms, your GP or specialist may consider blood tests, coeliac screening, inflammatory markers, thyroid testing, stool tests, breath testing or referral to gastroenterology.
4. Address constipation
Constipation can worsen bloating and gas. Hydration, regular meals, adequate fibre, movement, toileting routine and medical advice may all matter. If constipation is severe or longstanding, get guidance.
5. Consider the gut brain axis
Stress does not mean symptoms are “all in your head”. The gut and brain are physically connected through the nervous system, immune system and hormones. Anxiety, trauma-related difficulties, burnout and sleep loss can change gut sensitivity and motility.
Clinical Hypnotherapy, Clinical Medical Hypnotherapy, Counselling and Psychotherapy may help some people reduce gut-related fear, symptom vigilance, stress reactivity and avoidance patterns, particularly alongside appropriate nutrition and medical care.
Ireland-based vignette
A woman in her early 40s from County Limerick had years of bloating, constipation, sugar cravings, poor sleep and anxiety around eating out. She had tried several restrictive diets and was worried she would react to nearly everything. She also had heavy periods, low ferritin, perimenopause symptoms and a history of high work stress.
Her plan included GP blood testing, discussion of SIBO breath testing, nutrition review, constipation strategies, meal structure, nervous system work through Clinical Hypnotherapy, and Counselling for stress and food fear. Over time, the focus shifted from chasing single food triggers to improving digestion, confidence, energy and daily functioning.
This is an anonymised example and not a promise of outcome. Each person needs individual assessment.
FAQs
1. Is SIBO the same as IBS?
No. IBS is a disorder of gut brain interaction involving abdominal pain and altered bowel habits. SIBO is bacterial overgrowth in the small intestine. They can overlap, but they are not the same condition.
2. Can SIBO cause anxiety or low mood?
SIBO does not directly explain every emotional symptom. However, persistent digestive discomfort, food fear, poor sleep, nutrient issues and gut brain axis changes can contribute to anxiety, low mood, irritability and fatigue in some people.
3. Should I take probiotics if I think I have SIBO?
Not without guidance. Some people feel better with probiotics, while others feel worse. If probiotics increase bloating, gas or pain, stop and speak with a qualified practitioner.
4. Can children or teenagers have SIBO-type symptoms?
Children and teenagers can have bloating, constipation, diarrhoea, abdominal pain and food-related distress for many reasons. Medical assessment is important, especially if symptoms affect growth, school, eating, sleep or mood.
5. Does a low FODMAP diet treat SIBO?
A low FODMAP diet may reduce IBS-type symptoms for some people, but it is not a stand-alone cure for SIBO. It should ideally be supervised and followed by structured reintroduction.
6. Can Clinical Hypnotherapy help gut symptoms?
Gut-directed Clinical Hypnotherapy has evidence for IBS symptom management in some people. It may help by working with gut brain communication, stress physiology and symptom-related fear. It should sit alongside appropriate medical and nutrition care.
7. When should I book a consultation?
Consider booking if bloating, bowel changes, food reactions, fatigue, gut-related anxiety, emotional eating, sugar cravings, stress, trauma-related difficulties, hormonal symptoms or low mood are affecting daily life.
Book a Consultation Now
Claire Russell Therapy and CounsellingExperts.ie offer expert, confidential appointments for adults, teenagers and children.
Services include:
Registered Nutritionist services.
Counselling.
Psychotherapy.
Couples Counselling.
Marriage Counselling.
RTT.
Clinical Medical Hypnotherapy.
Clinical Hypnotherapy.
Hypnotherapy and Hypnosis for addictions, trauma-related difficulties, anxiety, gut brain axis issues, food cravings, sugar addiction, smoking, vaping, alcohol, gambling and emotional eating.
Appointments are available ONLINE across Ireland and internationally, and in person in Adare, Newcastle West, Limerick, Abbeyfeale, Charleville, Midleton, Youghal, Cork, Dublin and Dungarven.
To book, visit CounsellingExperts.ie or contact Claire Russell Therapy.
Author
Claire Russell is a Registered Nutritionist, Clinical Medical Hypnotherapist, Clinical Hypnotherapist, Counsellor, Psychotherapist and Advanced RTT practitioner with over 20 years of clinical experience across Ireland, the UK, Europe, UAE and worldwide. Claire works with gut and digestive issues, gut brain axis concerns, anxiety, stress, burnout, ADHD, OCD, autism spectrum presentations, addictions, trauma-related difficulties, weight loss, metabolic health, fertility, hormonal symptoms, autoimmune symptoms, chronic pain, fatigue, sleep, relationship difficulties, grief and emotional eating.
Contact us today to discuss how we can help
SIBO Symptoms, IBS Bloating and Gut Brain Health Ireland
SIBO, IBS, bloating, fatigue and gut brain symptoms. Expert nutrition, counselling and hypnotherapy ONLINE and across Ireland.
Contact Us Today to discuss your needs
Business name: CounsellingExperts.ie
Author: Claire Russell
Telephone: 00 353 87 616 6638
Website: https://www.counsellingexperts.ie
Service area: ONLINE across Ireland and internationally, and in person in Adare, Newcastle West, Limerick, Abbeyfeale, Charleville, Kanturk, Midleton, Youghal, Cork, Lismore, Dungarvan, Cork, Dublin and Dungarven
Services: Registered Nutritionist, Counselling, Psychotherapy, Couples Counselling, Marriage Counselling, RTT, Clinical Medical Hypnotherapy, Clinical Hypnotherapy, Hypnotherapy, Hypnosis for addictions, gut brain axis concerns, IBS-type symptoms, anxiety, trauma-related difficulties and emotional eating
References
- Pimentel M, Saad RJ, Long MD, Rao SSC. ACG Clinical Guideline: Small Intestinal Bacterial Overgrowth. American Journal of Gastroenterology. 2020.
https://pubmed.ncbi.nlm.nih.gov/32023228/ - Rezaie A, Buresi M, Lembo A, et al. Hydrogen and Methane-Based Breath Testing in Gastrointestinal Disorders: The North American Consensus. American Journal of Gastroenterology. 2017.
https://pubmed.ncbi.nlm.nih.gov/28323273/ - Vasant DH, Paine PA, Black CJ, et al. British Society of Gastroenterology guidelines on the management of irritable bowel syndrome. Gut. 2021.
https://gut.bmj.com/content/70/7/1214 - NICE. Irritable bowel syndrome in adults: diagnosis and management. Clinical guideline CG61.
https://www.nice.org.uk/guidance/cg61/chapter/1-recommendations - Ghoshal UC, Shukla R, Ghoshal U. Small intestinal bacterial overgrowth and irritable bowel syndrome: a bridge between functional organic dichotomy. Gut and Liver. 2017.
https://pubmed.ncbi.nlm.nih.gov/28395595/ - Ghoshal UC, Nehra A, Mathur A, et al. A meta-analysis on small intestinal bacterial overgrowth in patients with irritable bowel syndrome. Journal of Gastroenterology and Hepatology. 2020.
https://pubmed.ncbi.nlm.nih.gov/31750966/ - Shah A, Morrison M, Burger D, et al. Systematic review with meta-analysis: the prevalence of small intestinal bacterial overgrowth in inflammatory bowel disease. Alimentary Pharmacology and Therapeutics. 2019.
https://pubmed.ncbi.nlm.nih.gov/30735254/ - Pitcher CK, Ford AC, Savarino E, et al. Performance and Interpretation of Hydrogen and Methane Breath Testing Impact of North American Consensus Guidelines. Digestive Diseases and Sciences. 2022.
https://pubmed.ncbi.nlm.nih.gov/35366119/ - Parodi A, Paolino S, Greco A, et al. Small intestinal bacterial overgrowth in rosacea. Clinical Gastroenterology and Hepatology. 2008.
https://pubmed.ncbi.nlm.nih.gov/18456568/ - Patil AD. Link between hypothyroidism and small intestinal bacterial overgrowth. Indian Journal of Endocrinology and Metabolism. 2014.
https://pmc.ncbi.nlm.nih.gov/articles/PMC4056127/ - Zaidel O, Lin HC. The Impact of Small Intestinal Bacterial Overgrowth on Nutritional Status. Practical Gastroenterology. 2003.
https://med.virginia.edu/ginutrition/wp-content/uploads/sites/199/2015/11/zaidelarticle-July-03.pdf - Roszkowska P, et al. Small Intestinal Bacterial Overgrowth and Twelve Groups of Related Conditions. Nutrients. 2024.
https://pmc.ncbi.nlm.nih.gov/articles/PMC11117733/ - Mayer EA, et al. The neurobiology of irritable bowel syndrome. Molecular Psychiatry. 2023.
https://www.nature.com/articles/s41380-023-01972-w - Raskov H, Burcharth J, Pommergaard HC, Rosenberg J. Irritable bowel syndrome, the microbiota and the gut brain axis. Gut Microbes. 2016.
https://pmc.ncbi.nlm.nih.gov/articles/PMC5046167/ - Soufan F, et al. The Gut Brain Axis in Irritable Bowel Syndrome. Journal of Clinical Medicine. 2025.
https://pmc.ncbi.nlm.nih.gov/articles/PMC12006843/ - Häuser W, et al. Gut-directed hypnosis and hypnotherapy for irritable bowel syndrome. Frontiers in Psychology. 2024.
https://pmc.ncbi.nlm.nih.gov/articles/PMC11181908/ - Adler EC, et al. Gut-Directed Hypnotherapy for Irritable Bowel Syndrome: A Systematic Review and Meta-analysis. Neurogastroenterology and Motility. 2025.
https://pubmed.ncbi.nlm.nih.gov/40179285/ - NICE. Addendum to Clinical Guideline 61: evidence review and recommendations.
https://www.ncbi.nlm.nih.gov/books/NBK550721/ - Wielgosz-Grochowska JP, et al. Identification of SIBO Subtypes along with Nutritional Status. Nutrients. 2024.
https://pmc.ncbi.nlm.nih.gov/articles/PMC11242202/ - Da Silva BC, et al. Diagnosis and treatment of small intestinal bacterial overgrowth. Arquivos de Gastroenterologia. 2025.
https://pubmed.ncbi.nlm.nih.gov/39968993/
