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💧 Diarrhoea
What it is, what helps, and when to seek medical help.
General guidance only; it does not replace medical advice. Talk to your medical team before any decision about your treatment.
Frequently asked questions
Diarrhoea: what is it and why does it happen?
Diarrhoea is common during chemotherapy, abdominal radiotherapy, or as an effect of certain medicines. It can quickly lead to dehydration and electrolyte imbalances, so it needs to be managed promptly.
Diarrhoea: what helps?
- Drink plenty of fluids — water, clear soups, oral rehydration solutions (such as Gesol or Pedialyte).
- The BRAT diet: bananas, boiled rice, apple puree, toast — foods that help settle your bowels.
- Avoid dairy, fatty foods, fried foods, and foods high in insoluble fiber.
- Small, frequent meals rather than large ones.
- Probiotics (with your doctor's agreement) can shorten how long the episode lasts.
- Note the frequency and appearance of your stools so you can report them at your appointment.
Diarrhoea: when should you seek medical help?
Severe diarrhoea (more than 4–6 episodes a day), blood or mucus in your stool, fever, or signs of dehydration (dizziness, dark urine) — seek help urgently.
When to seek help
Severe diarrhoea (more than 4–6 episodes a day), blood or mucus in your stool, fever, or signs of dehydration (dizziness, dark urine) — seek help urgently.
See all warning signs