Short-lived and uncomplicated.
Fluids, gradual fibre changes and activity may help constipation. Fluids are the priority with diarrhoea. A pharmacist can advise on suitable short-term options.
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Bowel changes · GP care
Notice what is different. Know what needs checking.
Constipation, diarrhoea, urgency, bloating and changes in stool can follow diet, infection, medicines or functional bowel problems. Persistent or unexplained change deserves a GP assessment.
Blood, black stools, weight loss, anaemia symptoms or a lasting change should not be attributed to piles or IBS without assessment.
Choose a suitable route
Choose the right starting point.
Short-lived constipation or diarrhoea can often start with self-care, while blood or a persistent new pattern needs clinical review.
Persistent, recurrent or unexplained.
Arrange a review for a sustained change, regular bloating, weight loss, tiredness, pain, blood, repeated constipation or diarrhoea.
Explore GP appointmentsBleeding, dehydration or severe pain.
Use urgent care for dark stools, bloody diarrhoea or inability to keep fluids down; emergency care for heavy bleeding, sudden severe pain or collapse.
Contact NHS 111Iron tablets and some foods can darken stool, but black or dark-red stool can also indicate bleeding and needs urgent advice.
Notice the pattern
What changes the next step.
A bowel change is easier to assess when frequency, consistency and duration are described together.
Constipation
Hard or lumpy stool, straining, reduced frequency or incomplete emptying may respond to diet and pharmacy advice.
Diarrhoea
Loose or frequent stool is often short-lived, but duration, travel, antibiotics, fever, blood and dehydration matter.
Alternating pattern
Bloating, cramps and alternating stool can occur with IBS, but a new pattern requires assessment before labelling it.
Blood or weight change
Blood, black stool, unexplained weight loss, anaemia symptoms or an abdominal lump require clinical review.
A lasting change in stool shape, frequency or consistency is useful to report even when there is no pain.
A focused GP assessment
Look for common causes and important exceptions.
A GP can review diet, medicines and symptom pattern, then choose stool tests, blood tests, examination or referral when indicated.
Explore in-person GP care01
Define the change.
Discuss usual and current frequency, stool consistency, urgency, leakage, pain, bloating, blood or mucus and duration.
02
Review context.
Cover diet, fluids, travel, antibiotics, medicines, stress, family history, weight, fever and night-time symptoms.
03
Plan focused tests.
A rectal or abdominal examination, blood tests, stool samples or bowel referral may be recommended based on symptoms and risk.
A proportionate plan
Restore the pattern without hiding a red flag.
Treatment depends on whether the issue is constipation, infection, IBS, medicine-related or another bowel condition.
01
Support bowel routine
Gradual fibre, adequate fluids, movement and responding to the urge can help constipation; sudden large fibre increases may worsen bloating.
02
Prevent dehydration
With diarrhoea, take frequent fluids and consider pharmacy oral rehydration advice. Avoid anti-diarrhoeal medicine when it is unsuitable.
03
Treat the cause
A clinician may recommend medicine changes, targeted treatment, dietetic support or further investigation after assessment.
Do not stop a prescribed medicine that may be affecting your bowels without advice. Mention opioids, iron, metformin, antibiotics and laxatives.
Prepare for a useful review
A one-week bowel record can clarify the pattern.
Note frequency, stool consistency, urgency, pain, bloating, blood or mucus, night-time symptoms and food or medicine changes.
Bring details of weight loss, fever, fatigue, travel, antibiotics, family bowel history and any screening or test results. A photograph can sometimes help describe blood or stool colour.
Explore GP appointments ↗Good to know
Questions about bowel changes.
Practical answers to help you choose a sensible next step without trying to diagnose the concern yourself.
When should constipation be reviewed?
See a GP if it is not improving, keeps returning, comes with blood, weight loss, regular bloating, tiredness, tummy pain or a sudden change in bowel habit.
When is rectal bleeding urgent?
Use NHS 111 for black or dark-red stool or bloody diarrhoea. Call 999 or go to A&E for non-stop bleeding, a large amount of blood or large clots.
Could this be IBS?
Possibly, but IBS should not be assumed from one symptom. A clinician considers duration, pattern and warning signs before deciding whether further checks are needed.
Can I use laxatives long term?
A pharmacist can advise on short-term use. Regular or persistent constipation needs review, and longer-term treatment should be chosen around the cause.
Clinical information: NHS constipationNHS diarrhoea and vomitingNHS rectal bleeding. This information is general and does not replace individual medical advice.