Fluid and Kidney Health: Common Questions
How much to drink for kidney health, and when more is not better.
Last revised
Fluid and Kidney Health: the questions people actually ask, answered from published guidance.
Key takeaways
- General UK guidance: 6-8 drinks a day
- For stone prevention: 2.5-3 litres a day
- Most useful single change: Use urine colour as a daily guide.
- Commonest mistake: Forcing very large volumes well beyond thirst.
- See a doctor if any of the signs under "When to get help" below apply to you.
What is Fluid and Kidney Health?
How much to drink for kidney health, and when more is not better.
Why does it matter?
Adequate fluid prevents stones and infection, while people with advanced kidney disease or heart failure may be told to restrict it.
General UK guidance for Fluid and Kidney Health?
6-8 drinks a day.
For stone prevention for Fluid and Kidney Health?
2.5-3 litres a day.
Practical check for Fluid and Kidney Health?
Pale straw-coloured urine.
Fluid restriction for Fluid and Kidney Health?
Prescribed in some advanced kidney disease and heart failure.
What is the single most useful thing to do?
Use urine colour as a daily guide.
What is the most common mistake?
Forcing very large volumes well beyond thirst.
When should I see a doctor?
Follow your own clinical team's fluid advice over general guidance if you have advanced kidney disease or heart failure. Seek urgent help for passing very little urine, swelling with breathlessness, or confusion. Excessive plain water during endurance events can dangerously dilute blood sodium.
Where to go next
- A Q and A on Fluid and Kidney Health
- Fluid and Kidney Health in Five Minutes
- Fluid and Kidney Health — the reference entry
- What the Guidance Really Says About Diabetes and the Kidneys
- What the Guidance Really Says About Understanding eGFR
When to get help
Follow your own clinical team's fluid advice over general guidance if you have advanced kidney disease or heart failure. Seek urgent help for passing very little urine, swelling with breathlessness, or confusion. Excessive plain water during endurance events can dangerously dilute blood sodium.
Where this comes from
How this page was put together
Every figure, recommendation and warning above is taken from the guidance named in Where this comes from. Nothing on this page is inferred, summarised or generalised beyond what those bodies publish: where they give a number, it is their number, and where they are silent, so are we. Pages are rebuilt whenever the underlying record changes. Sign-off by a named clinician, where it has happened, is shown at the top of the page along with the date.
Medical disclaimer
This article is general information, not medical advice. It cannot account for your own history, medication or circumstances. Always speak to a GP, pharmacist or another qualified health professional before making changes that affect your treatment, and never delay seeking medical advice because of something you have read here. In an emergency, call 999.
