Everyday wellbeing
Dehydration: early signs and sensible next steps
Recognise fluid loss and understand when drinking more is not enough.
What it means
Dehydration happens when fluid loss exceeds intake. Thirst, a dry mouth, darker urine, tiredness and light-headedness can be clues.
What you can do
Drink fluids regularly. If nausea makes this difficult, try small sips. After vomiting or diarrhoea, a pharmacist can advise on oral rehydration solutions. Follow the product instructions.
When to seek urgent care
Get urgent advice for persistent dizziness on standing, very little urine, unusual drowsiness or a fast heartbeat. Children and older adults can become dehydrated more easily.
A note about individual needs
This guide is for general education. If a clinician has given you a fluid restriction or an individual care plan, ask them how to manage fluid loss.
Sources and further reading
Sources accessed 2026-09-29. Local care pathways vary. These guides use international wording; emergency numbers and services depend on your location.
This guide is general education, not a diagnosis or treatment plan. Content is AI-assisted and has not been reviewed by a medical professional. Read our editorial policy.