Acute Kidney Injury: Sudden Kidney Trouble
What acute kidney injury is, its causes, and how recovery works.
Last updated: 2026-09-24
Acute kidney injury (AKI) is a sudden drop in kidney function over hours or days. Unlike chronic disease, it is often reversible when treated promptly.
Common causes
- Severe dehydration or blood loss
- Serious infection (sepsis)
- Some medicines, including certain painkillers
- Urinary obstruction
Recovery
Treatment targets the cause, with careful fluid management. Some people need temporary dialysis. Early treatment greatly improves recovery.
Frequently asked questions
Is AKI the same as chronic kidney disease?
No. AKI is sudden and often reversible; CKD is gradual and usually permanent.
Can painkillers cause kidney failure?
Yes, certain NSAIDs, especially at high dose or during dehydration.