Chronic diarrhoea in adults means loose or watery stools continuing, or coming and going, for at least four weeks. Several conditions can cause it. Recording the pattern can help a doctor assess what is happening, but bleeding, severe pain or dehydration needs attention sooner. You do not need to wait four weeks to seek help.
When loose motions keep interrupting meals, sleep or your journey to work, it can be difficult to explain the pattern from memory. A short, accurate record is more useful than trying to decide which condition you have. This guide explains what to note and what to expect during an assessment.
Chronic diarrhoea in adults: what does it mean?
Diarrhoea describes stools that are loose or watery and occur more often than is normal for you, commonly three or more times a day. “Chronic” describes the duration, not the diagnosis. Symptoms lasting at least four weeks can be continuous or intermittent. A few better days do not necessarily explain why the problem keeps returning.
Which symptoms mean you should seek help sooner?
Seek emergency care for severe symptoms
Go to the nearest emergency department if you have heavy or ongoing rectal bleeding, sudden severe abdominal pain, confusion, collapse or difficulty staying awake. Do not drive yourself if you are faint or severely unwell.
Arrange prompt medical assessment
Seek medical advice promptly for blood in the stool, black tarry stools, fever, repeated vomiting, reduced urine or persistent dizziness. Unintentional weight loss and diarrhoea that wakes you at night also need discussion. If diarrhoea continues beyond two days, contact a clinician rather than waiting for it to meet the chronic definition. Older adults, pregnant people and those with weakened immunity or recent antibiotic use should seek advice early.
If weight is falling without an intended change in eating or activity, our guide to unexplained weight loss with digestive symptoms explains what information to bring to an assessment.
What should you record before your appointment?
Use a notebook or a note on your phone. You do not need a perfect diary or several weeks of entries before seeing a doctor. Start with what you can remember, then record new symptoms while you arrange care.
| What to note | Useful detail |
| Timing | When symptoms began; whether they happen daily, after meals or during the night. |
| Bowel pattern | Number of bowel movements, urgency and whether stools are watery, loose or visibly bloody. |
| Other symptoms | Pain, bloating, fever, vomiting, appetite changes or weight change. |
| Food and medicines | Meals or drinks before symptoms; prescribed medicines, supplements and recent antibiotics. |
| Recent events | Travel, illness, changes in routine and previous digestive conditions or surgery. |
Record observations without assigning a cause. “Loose stools after breakfast on three days” gives the doctor something specific to explore; “I definitely have a food intolerance” may close off other explanations too early. Bring previous reports and a complete medicine list as well.
If you also notice a recurring jelly-like coating, our guide to mucus in stool explains what to note. Mention associated blood or pain when describing the change.
What possible causes might a doctor consider?
Ongoing diarrhoea can occur with food intolerances, some infections, medicine effects, inflammatory bowel disease and conditions that affect digestion or nutrient absorption. Irritable bowel syndrome and other conditions involving communication between the gut and brain can also cause a recurring bowel pattern. These conditions can share symptoms, so frequency or stool appearance alone cannot separate them.
Coeliac disease, for example, can cause diarrhoea and other digestive symptoms, but symptoms vary considerably. A diagnosis needs appropriate clinical evaluation. Do not assume that avoiding a food confirms or rules out a condition.
If you notice a pattern after milk or milk-based foods, read our explanation of lactose intolerance. This can help you describe the pattern without treating dairy as the explanation for every episode.
What happens during a medical assessment?
History and examination
A doctor will ask about the duration and pattern, medicines, diet, previous illness and relevant family history. Examination may include checking hydration and the abdomen. Mention changes that are difficult to discuss, such as urgency or leakage; they are useful clinical information.
Tests selected for your situation
Depending on the findings, a clinician may recommend stool tests, blood tests or further investigation. These answer different questions, such as whether infection or another underlying condition needs consideration. Endoscopic tests, including colonoscopy, are used when indicated rather than automatically for everyone with loose stools.
Ask what each suggested test is intended to investigate, whether preparation is required and how the result will affect the next step. If an initial result is normal but symptoms continue, tell the clinician; follow-up is part of the assessment rather than proof that the symptoms are unimportant.
What can you prepare while waiting for assessment?
Keep fluids available and seek advice if you are struggling to replace what you lose. A pharmacist or clinician can advise whether an oral rehydration solution is appropriate. People with kidney disease, diabetes or other conditions affecting fluid intake may need individual advice. Do not rely on hydration alone when warning signs are present.
Avoid making several major dietary changes at once or starting repeated courses of medicines without advice. Do not stop prescribed medicines independently; bring them to the consultation so their possible role can be reviewed. Your aim is to arrive with a clear account of the problem, not a self-selected diagnosis or test package.
Frequently asked questions
How long does diarrhoea have to last to be called chronic?
The usual definition is at least four weeks. This describes the symptom pattern and does not mean you should wait that long for advice. Bleeding, dehydration, severe pain or other concerning symptoms need earlier assessment.
Can chronic diarrhoea come and go?
Yes. The pattern may include days when stools improve and days when they become loose again. Record both, including changes in meals, medicines and other symptoms. Repeated episodes still warrant assessment even if you feel better between them.
What should I record before seeing a doctor?
Note when the problem started, bowel frequency, stool appearance and associated symptoms. Include medicines, recent travel and any food pattern you have noticed. A few accurate observations are useful; do not delay an appointment to complete a diary.
Will everyone need a colonoscopy?
No. The choice of tests depends on the history, examination and any initial results. A clinician may recommend colonoscopy when it can answer a relevant question, but it is not a routine requirement for every person with diarrhoea.
Should I stop dairy before my appointment?
A repeated food pattern is worth mentioning, but it does not confirm lactose intolerance. Discuss any trial of dietary restriction with your clinician, especially if your intake is already limited or you are losing weight.
What to take from this guide
A symptom diary, a medicine list and previous reports can make the consultation more focused. Keep urgent symptoms separate from the diary task: get help when needed, and use the record to support the assessment rather than postpone it.
Medical information note
This article provides general health information and does not diagnose a condition or replace individual medical advice. Seek medical care for persistent or concerning symptoms, and emergency care for the warning signs described above.