Quick answer
What could diarrhoea mean?
Diarrhoea — passing loose or watery stools more often than usual — is usually caused by gastroenteritis and settles within a few days. The main risk is dehydration, so fluid replacement is key. Blood in diarrhoea, severe pain or symptoms lasting over a week need a GP review.
Understanding diarrhoea
Diarrhoea means passing loose or watery stools three or more times in 24 hours, or more frequently than is normal for you. It reflects faster transit through the bowel or reduced water absorption.
Most cases in adults are short-lived infections. The priority is preventing dehydration while the gut recovers.
Common causes
Gastroenteritis from norovirus or food poisoning is the most common cause. IBS, coeliac disease, lactose intolerance and inflammatory bowel disease cause recurrent or chronic diarrhoea.
Medicines including antibiotics and metformin can trigger diarrhoea. Bowel infections such as C. difficile may follow antibiotic use.
Self-care and hydration
Drink plenty of fluids — water, diluted squash, or oral rehydration salts from a pharmacy. Eat light meals as tolerated.
Wash hands thoroughly to prevent spread. Avoid preparing food for others until 48 hours after symptoms stop.
When to seek help
See a GP for bloody diarrhoea, persistent symptoms, unexplained weight loss, or diarrhoea at night waking you from sleep.
Signs of dehydration — dizziness, reduced urination, dry mouth — need prompt fluid replacement and medical advice if severe.
Common questions about diarrhoea
- How long should diarrhoea last?
- Most infectious diarrhoea improves within 2–4 days. See a GP if it persists beyond a week or keeps returning.
- Should I stop eating when I have diarrhoea?
- Eat small, plain meals as tolerated — bananas, rice, toast and potatoes are often easier to digest. Avoid fatty, spicy foods and large amounts of dairy initially.
- Can antibiotics cause diarrhoea?
- Yes — antibiotics disturb gut bacteria and can cause diarrhoea. Contact a GP if diarrhoea is severe, bloody, or occurs during or after antibiotics — C. difficile infection needs prompt treatment.
- When is diarrhoea dangerous for children?
- Children dehydrate quickly — seek urgent help for reduced wet nappies, sunken eyes, dry mouth, or lethargy. NHS guidance covers when to call 111 or attend A&E.