Dehydration and the Kidneys
How dehydration can stress or injure the kidneys, and how much to drink.
Last updated: 2026-09-24
Severe or repeated dehydration reduces blood flow to the kidneys and can cause acute kidney injury.
How much to drink
For most healthy people, drinking to keep urine pale is a good guide. In advanced kidney disease, fluid may instead be restricted.
Frequently asked questions
Can dehydration permanently damage kidneys?
Repeated severe dehydration can contribute to kidney damage, especially in hot climates or with certain medicines.