Irritable bowel syndrome
Irritable Bowel Syndrome (IBS): Symptoms, Causes and Support
Irritable bowel syndrome, or IBS, is a long-term digestive condition involving recurring abdominal pain and changes in bowel habits, such as diarrhoea, constipation or both.1
IBS is classified as a disorder of gut–brain interaction. This means that digestive function, gut sensation and signals between the digestive system and brain can all play a part.5
Symptoms are real and can significantly affect work, food choices, travel, relationships and daily confidence. IBS does not normally cause visible damage to the digestive tract, but other conditions may produce similar symptoms and require different care.2
This page cannot diagnose IBS or determine the cause of someone’s symptoms.
re-origin provides complementary nervous-system education and support. It does not replace gastrointestinal assessment, dietary care or medical treatment.
When digestive symptoms need medical advice
New, severe, persistent or unexplained digestive symptoms should not automatically be assumed to be IBS. Seek medical advice for symptoms such as blood in the stool, unexplained weight loss, persistent fever, repeated vomiting, anaemia, severe or rapidly worsening pain, or symptoms that regularly wake you from sleep.4
Seek urgent help for severe pain, collapse, heavy bleeding or another possible medical emergency.
Understanding the condition
What is irritable bowel syndrome?
IBS is a chronic disorder involving recurring abdominal pain and changes in bowel movements — diarrhoea, constipation or both — often with bloating, gas or a feeling of incomplete emptying.13
It is classified as a disorder of gut–brain interaction: digestive function, gut sensation and the signals travelling between the gut and brain all play a part.56
IBS does not normally produce visible injury or inflammation in the digestive tract. That does not make the symptoms imaginary. “Functional”, the older term, describes how the digestive system works and communicates — not whether the experience is real.
Pain and cramping
- Recurring abdominal pain
- Cramping
- Pain related to bowel movements
- Pain that varies in place or intensity
Bowel changes
- Diarrhoea, constipation or both
- Changes in stool form or frequency
- Urgency
- Straining
Bloating and sensations
- Bloating and visible distension
- Gas
- Feeling unable to empty fully
- Mucus in the stool
- Discomfort after eating
Everyday impact
- Planning around toilet access
- Restricting travel or social plans
- Changes in food choices
- Disrupted sleep
- Reduced confidence
Living with IBS
When digestive symptoms begin to shape everyday life
IBS can begin to influence far more than digestion. Fear of urgency, constant planning, uncertainty around food and previous difficult experiences can affect travel, work, relationships and confidence.
Medical and dietary care can help assess and manage the digestive condition. re-origin provides structured support for the stress responses, symptom monitoring, avoidance and loss of confidence that may develop around it.
- Fear of urgency
- Monitoring digestive sensations
- Avoiding travel or social meals
- Reduced confidence leaving home
These patterns do not mean that fear or anxiety caused the IBS.
IBS, other conditions and warning signs
Several conditions produce similar symptoms but need different assessment and treatment. Having IBS does not rule any of them out.
Irritable bowel syndrome
- A disorder of gut–brain interaction
- Recurring pain with bowel changes
- No visible bowel damage in most people
- Does not turn into inflammatory bowel disease
Inflammatory bowel disease
- Crohn’s disease and ulcerative colitis
- Involves intestinal inflammation
- May cause bleeding, weight loss or anaemia
- Needs different assessment and treatment
Celiac disease
- Immune-mediated, triggered by gluten
- Can damage the small intestine
- Needs specific testing
- Test before starting a gluten-free diet, unless advised otherwise
Other explanations a clinician may consider
Lactose intolerance · bile acid diarrhoea · microscopic colitis · pelvic-floor dysfunction · endometriosis · medication effects · infection · thyroid conditions · colorectal disease · another disorder of gut–brain interaction.4
When symptoms need reassessment
New or changed symptoms should not be put down to an existing IBS diagnosis. Blood in the stool, unexplained weight loss, fever, repeated vomiting, anaemia, severe or worsening pain, or symptoms that wake you from sleep all warrant medical review.4
The gut and nervous system
IBS and the gut–brain interaction
The gut and nervous system
There is no single universal cause. Gut motility, visceral sensitivity, gut–brain communication, previous infection, the microbiota, food, genetics, stress and early-life experience may all interact differently from person to person.24
The digestive tract communicates with the brain through neural, hormonal, immune and metabolic pathways, and the enteric nervous system coordinates activity within the gut itself.5 Visceral sensitivity — how strongly internal sensations register — is one proposed mechanism, not a complete explanation. Heightened sensitivity does not make pain imagined or controllable at will.4
Stress affects digestion and how symptoms are experienced. That is not the same as stress being the cause, and it does not make IBS psychological.
Food, movement and sensations within the digestive tract
Signals travel between the gut, spinal cord and brain
Motility, sensation, attention and past experience shape the response
The result may be pain, urgency, bloating or bowel changes
A simplified explanation, not one proven cause of IBS.
Does IBS cause neurological symptoms?
“Neurological IBS” is not a formal diagnosis, and IBS is not usually classified as a neurological disease.5 People with IBS do often report fatigue, headache, poor sleep, dizziness, concentration difficulty or overlapping conditions such as migraine or fibromyalgia — described as extraintestinal or coexisting rather than diagnostic.10
Why they overlap is not fully understood, and an association does not prove IBS caused the other symptom. New weakness, loss of sensation, fainting, seizures, speech changes or severe confusion need separate medical assessment and should never be explained as IBS.
How IBS is diagnosed and assessed
Diagnosis rests on the symptom pattern, medical history and clinical assessment, with targeted tests where another condition needs ruling in or out. Current guidance supports making a positive diagnosis rather than excluding every possibility first.4
Not everyone with a typical pattern needs extensive investigation — and normal results do not mean the symptoms are imaginary.
The Rome IV criteria in full
Recurrent abdominal pain, on average at least one day per week over the previous three months, associated with two or more of:6
- Related to bowel movements
- A change in stool frequency
- A change in stool form or appearance
Criteria met for the previous three months, with onset at least six months before diagnosis.
Rome criteria standardise diagnosis and research; they do not replace clinical judgement, and many clinicians work more flexibly in practice.5
Tests a clinician may consider
- Blood tests where clinically appropriate
- Celiac-disease testing
- Faecal calprotectin where IBD needs considering
- Stool testing in selected cases
- Colonoscopy or imaging where the history indicates
- Review of medication effects and pelvic-floor function
Treatment and professional support
Treatment is individual and usually combines approaches, depending on whether constipation, diarrhoea, pain or bloating is most disruptive.4
Diet
A clinician or registered dietitian can identify proportionate changes while protecting nutrition. There is no single IBS diet.7
Low-FODMAP
A limited trial helps some people. It is built around restriction, reintroduction and personalisation — not permanent avoidance.47
Fibre
Soluble fibre may help overall symptoms; increasing it too quickly can worsen gas or bloating.9
Medication
Different medicines target constipation, diarrhoea, pain or spasm. Discuss options with a clinician or pharmacist.4
Gut-directed therapy
CBT and hypnotherapy designed for digestive symptoms have been studied in IBS and may form part of care — not because symptoms are imaginary.8
Gluten-free diets should not begin before celiac testing without professional advice, and commercial food-sensitivity panels should not shape an IBS diet. re-origin is not a substitute for gut-directed CBT or hypnotherapy.
Beyond information
When managing IBS affects more than digestion
Finding appropriate care matters. But people may still need practical help with fear of urgency, body monitoring, avoidance, routines and confidence.
re-origin combines neuroplasticity education, brain-body practices, somatic tools, coaching and community to help members work with these everyday patterns alongside their healthcare.
The re-origin approach
How re-origin fits alongside IBS care
re-origin is designed for people whose symptoms have begun to influence how they think, plan, respond and participate in everyday life.
For someone living with IBS, that may include anticipatory stress before leaving home, close monitoring of digestive sensations, automatic avoidance and reduced confidence around food, travel or social situations.
The Program provides a structured way to learn and practise new responses, with education, brain-body practices, somatic tools, coaching and community support.
This support sits alongside medical, dietary and psychological care. It is not a replacement for IBS assessment or treatment, and it does not determine whether a symptom or food is medically safe.
Science-informed neuroplasticity programs, practices, coaching, and community for nervous system regulation. Built by people who’ve lived it. Designed to meet you where you are. Carried by community.
What is included
What members receive
Science-informed neuroplasticity programs, practices, coaching, and community for nervous system regulation. Built by people who've lived it. Designed to meet you where you are. Carried by community.
Brain retraining
Structured practices that give members opportunities to respond differently to familiar stress, attention and behavioural patterns.
Nervous-system regulation
Develop a wider repertoire of responses for moments when stress, uncertainty or activation feels intense.
Somatic practices
Work with physical activation and body-based responses through gentle practices that can be adapted to the individual.
Neuroplasticity education
Understand how experience, attention, repetition and learning can shape nervous-system responses over time.
Coaching
Get help applying the Program to real-life situations, setbacks and difficult grey areas. Coaching, not psychotherapy.
Community
Connect with people who understand persistent symptoms, nervous-system sensitivity and the effect they can have on everyday life.
Related reading and resources
Related reading and resources
The re-origin Program
Education, brain-body practices, somatic tools, coaching and community in one structured Program.
Science and Results
The research and principles informing re-origin’s approach, including its limitations.
What neuroplasticity means
How the nervous system changes through experience and learning, and where that fits alongside care.11
Meet the coaches
Group, one-to-one and somatic coaching options for applying the Program consistently.
Stories from re-origin members
Personal accounts from people living with a range of chronic conditions. Individual experiences vary and do not predict anyone else’s outcome.
The re-origin blog
Articles, member experiences and practical nervous-system education.
Questions
Questions and answers
What is irritable bowel syndrome?
What causes IBS?
There is no single universal cause. Differences in gut motility, visceral sensitivity, gut–brain communication, previous infection, food-related factors, genetics, stress and other biological or environmental influences may interact.24
A contributing factor is not necessarily the underlying cause for every person.
Is IBS a neurological condition?
IBS is not usually classified as a neurological disease. It is described as a disorder of gut–brain interaction because the digestive system and nervous system communicate in both directions.5
This does not mean IBS is caused by one brain region or by nervous-system damage.
Can IBS cause neurological symptoms?
Some people with IBS also experience fatigue, headache, dizziness, sleep disturbance or concentration difficulties. These are generally described as extraintestinal symptoms or overlapping conditions rather than diagnostic neurological symptoms of IBS.10
New neurological symptoms should receive separate medical assessment.
Is IBS the same as inflammatory bowel disease?
How is IBS diagnosed?
What are the IBS subtypes?
The main subtypes are IBS with constipation, IBS with diarrhoea, mixed IBS and unclassified IBS.6
A person’s bowel pattern may change over time.
Does stress cause IBS?
Stress can influence digestive function and how symptoms are experienced, but it is not the only cause of IBS.4
IBS is a complex condition involving biological, psychological and social influences.
Does everyone with IBS need a low-FODMAP diet?
No. A limited low-FODMAP diet may help some people, but it is not suitable or necessary for everyone.7
It should include structured reintroduction and personalisation rather than permanent broad restriction.
Can psychological therapy help IBS?
Gut-directed cognitive behavioural therapy and hypnotherapy have been studied for IBS and may help some people.8
Their use does not mean that symptoms are imaginary or purely psychological.
Can neuroplasticity treat IBS?
Neuroplasticity describes the nervous system’s ability to change through experience and learning.11
Neuroplasticity-informed education may be useful for factors such as symptom-related fear, attention, avoidance and coping, but it has not established re-origin as a treatment for IBS.
How may re-origin be relevant?
re-origin provides neuroplasticity education, brain-body practices, somatic tools, coaching and community support.
It is designed to complement appropriate care by helping members work with stress responses, symptom-related fear, body awareness, routines and confidence. It does not diagnose or treat IBS.
When should I seek medical advice?
Seek advice for new, severe, worsening or unexplained symptoms, particularly blood in the stool, unexplained weight loss, fever, anaemia, persistent vomiting, severe pain or symptoms regularly waking you from sleep.4
Seek urgent care for severe pain, collapse, heavy bleeding or another possible emergency.
Structured support for life around persistent symptoms
When IBS begins to affect meals, travel, work, relationships or confidence, information alone may not be enough.
re-origin provides science-informed education, practical brain-body and somatic practices, coaching and community support in one structured Program.
It is designed to complement appropriate gastrointestinal, dietary and psychological care.
re-origin does not diagnose or treat IBS.
Medical disclaimer
The information on this page is provided for educational purposes only. It is not intended to diagnose, treat, cure or prevent any condition and does not replace assessment, diagnosis or treatment from qualified healthcare professionals. Do not start, stop or change medication or treatment based on this page. Seek appropriate medical advice for new, severe, worsening or unexplained symptoms.
References
- National Institute of Diabetes and Digestive and Kidney Diseases. Irritable Bowel Syndrome (IBS). Read the NIDDK overview View source
- National Institute of Diabetes and Digestive and Kidney Diseases. Symptoms & Causes of Irritable Bowel Syndrome. Read the NIDDK symptoms and causes page View source
- American College of Gastroenterology. Irritable Bowel Syndrome — patient information. Read the ACG patient guidance View source
- Lacy BE, Pimentel M, Brenner DM, et al. ACG Clinical Guideline: Management of Irritable Bowel Syndrome. American Journal of Gastroenterology. 2021;116(1):17–44. doi:10.14309/ajg.0000000000001036. View the DOI record View source
- Drossman DA, Hasler WL. Rome IV—Functional GI Disorders: Disorders of Gut–Brain Interaction. Gastroenterology. 2016;150(6):1257–1261. doi:10.1053/j.gastro.2016.03.035. View the DOI record View source
- Mearin F, Lacy BE, Chang L, et al. Bowel Disorders. Gastroenterology. 2016;150(6):1393–1407. doi:10.1053/j.gastro.2016.02.031. View the DOI record View source
- Chey WD, Hashash JG, Manning L, Chang L. AGA Clinical Practice Update on the Role of Diet in Irritable Bowel Syndrome. Gastroenterology. 2022;162(6):1737–1745.e5. PMID: 35337654. View on PubMed View source
- Black CJ, Thakur ER, Houghton LA, Quigley EMM, Moayyedi P, Ford AC. Efficacy of Psychological Therapies for Irritable Bowel Syndrome: A Systematic Review and Network Meta-Analysis. Gut. 2020;69(8):1441–1451. PMID: 32276950. View on PubMed View source
- Moayyedi P, Quigley EMM, Lacy BE, et al. The Effect of Fiber Supplementation on Irritable Bowel Syndrome: A Systematic Review and Meta-Analysis. American Journal of Gastroenterology. 2014;109(9):1367–1374. PMID: 25070054. View on PubMed View source
- Whitehead WE, Palsson O, Jones KR. Systematic Review of the Comorbidity of Irritable Bowel Syndrome with Other Disorders. Gastroenterology. 2002;122(4):1140–1156. PMID: 11910364. View on PubMed View source
- Cramer SC, Sur M, Dobkin BH, et al. Harnessing Neuroplasticity for Clinical Applications. Brain. 2011;134(6):1591–1609. doi:10.1093/brain/awr039. View the DOI record View source