Health condition
Bile acid diarrhoea
Bile acid diarrhoea is a commonly missed cause of chronic watery diarrhoea, in which excess bile acids reach the colon; it responds well to bile acid binder medication.
Why trust this guide
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Editorial team
Written by our editorial team from the UK sources listed on each page.
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Sourced from guidance
Checked against current NHS and UK specialist society guidance at the time of review.
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Current for 2026
Reviewed on 2026-09-27 with the next review scheduled for 2027-09-27.
Key facts
The essentials at a glance.
The symptoms to recognise, when to seek help, which specialist to see, and what treatment usually involves.
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Typical symptoms: frequent watery diarrhoea, urgency, and sometimes nocturnal bowel movements
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See your GP if diarrhoea lasts more than a few weeks, especially after gallbladder removal
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Specialist: a consultant gastroenterologist can arrange a SeHCAT scan to confirm it
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Treatment options include bile acid binders such as colesevelam or colestyramine and a lower-fat diet
Understanding the condition
What it is and what happens next.
What causes it, how it is diagnosed, and the treatment routes available in the UK.
What it is and how it feels
Bile acid diarrhoea occurs when too much bile acid escapes reabsorption in the small bowel and spills into the colon, where it draws in water and stimulates contractions. It can follow gallbladder removal or Crohn’s disease of the terminal ileum, or arise on its own, and is frequently mislabelled as IBS with diarrhoea.
Diagnosis and treatment routes
The condition is confirmed with a SeHCAT retention scan or, in some centres, a therapeutic trial of a bile acid binder. Treatment with colestyramine or colesevelam, sometimes with a modest reduction in dietary fat, controls symptoms in most people. In many parts of the UK, routine NHS referrals for this kind of problem currently take 20-45+ weeks, whereas an initial appointment with a private consultant is typically available within around two weeks.
Seeing a specialist
Who to see, and how quickly you can be seen.
The specialist for this condition is usually a consultant gastroenterologist. Your GP can refer you on the NHS, or you can arrange a private consultation directly.
A quiet reminder
This guide is for information, not medical advice.
Your GP knows your history and can tell you which parts apply to you. If in doubt, see them - and seek urgent care for any of the emergency symptoms described above.
Frequently asked
Common questions about Bile acid diarrhoea.
Quick, plain-English answers to what people ask us most.
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What is bile acid diarrhoea?
Bile acid diarrhoea is a recognised medical condition that can affect people in different ways, ranging from mild and easily managed to more significant, depending on the underlying cause, how early it is picked up, and how it is treated. Getting a clear diagnosis is usually the first step towards the right management plan.
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What causes bile acid diarrhoea?
Bile acid diarrhoea can arise from a combination of factors, which may include genetics, lifestyle, environmental exposures, other underlying health conditions, or simply the normal effects of ageing on the body. In many cases no single cause is found, and several factors act together. A clinician can help identify which factors are most relevant in an individual case.
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What are the symptoms of bile acid diarrhoea?
Symptoms of bile acid diarrhoea vary from person to person and depend on how severe the condition is and which structures are affected. Some people notice symptoms gradually over weeks or months, while others experience a more sudden onset. Because symptoms can overlap with other conditions, a proper assessment is important to reach an accurate diagnosis rather than relying on symptoms alone.
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Is bile acid diarrhoea serious or dangerous?
Most cases of bile acid diarrhoea are manageable, especially when identified and treated early, but severity varies from mild and self-limiting to more significant, depending on individual circumstances. Left unassessed, some cases can lead to complications or a longer-term impact on daily life. If you are worried about your symptoms, it is always worth getting them checked rather than waiting.
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Is bile acid diarrhoea hereditary or genetic?
Some cases of bile acid diarrhoea have a genetic component and can run in families, while others occur without any family history at all. Having a relative with the condition may modestly increase your own risk, but it does not mean you will definitely develop it yourself. If you are concerned about a family history, mention this to your doctor, as it may occasionally influence screening or monitoring.
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Can bile acid diarrhoea be cured, reversed or prevented?
Outlook varies with bile acid diarrhoea: some cases resolve completely with treatment, others improve significantly but need ongoing management, and a smaller number become a long-term condition to be controlled rather than cured. Prevention strategies, such as addressing modifiable risk factors, can reduce your chances of developing it or of it recurring, but cannot guarantee against it in every case.
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How is bile acid diarrhoea treated?
Treatment for bile acid diarrhoea is tailored to the individual and depends on severity, underlying cause and personal circumstances. Options can range from simple lifestyle measures, monitoring and conservative treatment through to medication, specialist procedures or surgery in more significant cases. A specialist assessment helps identify which combination of treatments is most appropriate for you.
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How long does bile acid diarrhoea last?
The duration of bile acid diarrhoea varies considerably: some people recover within days or weeks, while others live with a more persistent or recurring condition that needs ongoing management. Response to treatment, how early it is started, and individual factors all influence the timescale. Your clinician can give you a more personalised estimate once your specific circumstances are known.
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When is surgery needed for bile acid diarrhoea?
Surgery is not usually the first option for bile acid diarrhoea and is generally reserved for cases where conservative treatment has not worked, symptoms are severe, or there is a significant structural problem that needs to be corrected directly. The decision depends on your specific findings, symptoms and how they are affecting your life. A specialist consultation is the best way to establish whether surgery is being considered too early, or should be considered sooner rather than later.
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When should I see a doctor about bile acid diarrhoea, and how quickly can I be seen privately?
It is worth seeing a doctor about bile acid diarrhoea if symptoms are persistent, getting worse, or affecting your daily life, rather than waiting to see if they settle on their own. NHS routine referrals to a specialist can currently take anywhere from around 20 to 45 weeks or more depending on your area, whereas a private consultant can typically see you within about 2 weeks. Getting an earlier assessment can help clarify the diagnosis and start the right treatment sooner.