Acute kidney injury (AKI) is a sudden decrease in kidney function occurring over hours to days. The following is general information about typical causes, warning signs and referral pathways; seek evaluation from a healthcare professional for any concerns.
AKI happens when the kidneys suddenly become less able to remove waste and balance fluids. Common triggers include large fluid losses or low blood pressure, severe infections (sepsis), major surgery, urinary tract obstruction and effects of certain medications. Clinically AKI is grouped by mechanism: pre-renal (reduced blood flow to the kidneys), intrinsic renal (direct damage to kidney tissue) and post-renal (obstruction of urine flow).
Symptoms can include reduced urine output or none at all, swelling of legs or face, breathlessness, fatigue, nausea and confusion. Seek immediate emergency care for sudden large drop in urine, severe breathlessness, chest pain, fainting or marked confusion. These recommendations are general — a healthcare professional can determine urgency based on the full clinical picture.
Diagnosis commonly uses blood tests (kidney function markers), urine analysis and imaging such as ultrasound to check for obstruction. Urine output is closely monitored in at-risk patients. Test selection and follow-up depend on the clinical setting and should be directed by a clinician; repeated tests help determine whether kidney function is recovering or worsening.
Risk increases with older age, chronic kidney disease, diabetes, heart failure, severe infection and dehydration or major surgery. Preventive steps include recognising dehydration or prolonged vomiting/diarrhoea, discussing medication risks with your care team before procedures, and prompt assessment when symptoms develop. Routine clinical review is important for people with known risk factors.
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