Health condition
Change in bowel habit
A persistent change in bowel habit, looser, harder, more or less frequent stools for more than three to four weeks, is a symptom to investigate, not to watch indefinitely.
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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Any sustained change lasting over three weeks deserves a GP review, especially after 50
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Red flags: bleeding, weight loss, abdominal pain, anaemia or nocturnal symptoms
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Specialist: a consultant gastroenterologist
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Investigation typically involves a FIT test, blood tests, calprotectin and colonoscopy where indicated
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
Bowels vary day to day, but a genuine shift from your normal pattern that persists, new looseness, new constipation, alternating stools, or a feeling of incomplete emptying, has a defined list of causes ranging from diet and medication through IBS, coeliac disease and thyroid problems to inflammatory bowel disease and bowel cancer.
Diagnosis and treatment routes
The FIT stool test now guides urgency: it detects microscopic blood and helps GPs decide who needs rapid colonoscopy. Alongside it, simple bloods, coeliac serology and calprotectin identify most causes; treatment follows the diagnosis rather than guesswork. 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 Change in bowel habit.
Quick, plain-English answers to what people ask us most.
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What does a change in bowel habit mean?
A change in bowel habit refers to a noticeable and persistent shift in the frequency, consistency, or nature of bowel movements from what is normal for you — for example, new or worsening constipation, diarrhoea, or alternating between the two. It is a symptom rather than a diagnosis in itself and can have many possible causes, ranging from minor and temporary to more significant. Persistence over several weeks is generally what prompts medical assessment.
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What causes a change in bowel habit?
Common causes include dietary changes, medication side effects, infections, irritable bowel syndrome, and stress or anxiety. Less commonly, but importantly, it can be an early symptom of bowel conditions including inflammatory bowel disease or bowel cancer, particularly in older adults or when accompanied by other concerning symptoms. Identifying the specific pattern and any associated symptoms helps guide appropriate investigation.
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When is a change in bowel habit concerning?
It is more concerning when persistent (lasting more than a few weeks), especially in people over 50, or when accompanied by symptoms such as unexplained weight loss, blood in the stool, abdominal pain, or a feeling of incomplete emptying. These combined features increase the likelihood of a more significant underlying cause needing prompt investigation. Isolated, brief changes are much less likely to indicate anything serious.
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Is a change in bowel habit always serious?
No, most cases are caused by relatively minor and temporary factors such as diet, medication, or a stomach bug, and resolve on their own. However, because it can occasionally be an early sign of something more serious, persistent unexplained changes, particularly with any other concerning symptoms, deserve proper medical assessment rather than being assumed to be benign. Your doctor can help determine the likely cause based on your specific pattern and history.
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What tests might be done?
Assessment often starts with a detailed history and examination, sometimes followed by stool tests, blood tests, and, if there are concerning features or the change persists, further investigation such as colonoscopy to directly examine the bowel lining. The specific tests recommended depend on your age, symptoms, and any additional risk factors. This stepwise approach helps identify the cause efficiently.
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How is it treated?
Treatment depends entirely on the underlying cause once identified — dietary and lifestyle adjustments for functional causes, medication review if a drug is responsible, specific treatment for infections or inflammatory bowel disease, or appropriate cancer treatment if that is found to be the cause. Getting an accurate diagnosis first is essential before treatment can be properly targeted.
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When should I see a doctor?
See a doctor if a change in bowel habit persists for more than a few weeks, particularly with weight loss, bleeding, or abdominal pain, or if you are over 50. NHS urgent referral pathways for concerning symptoms aim to be prompt, though waits can still occur; a private gastroenterology consultation is typically available within about 2 weeks for earlier investigation.