Acute kidney failure occurs when your kidneys suddenly become unable to filter waste products from your blood. When your kidneys lose their filtering ability, dangerous levels of wastes may accumulate, and your blood’s chemical makeup may get out of balance. Acute kidney failure — also called acute renal failure or acute kidney injury — develops rapidly, usually in less than a few days. Acute kidney failure is most common in people who are already hospitalized, particularly in critically ill people who need intensive care. Acute kidney failure can be fatal and requires intensive treatment. However, acute kidney failure may be reversible. If you’re otherwise in good health, you may recover normal or nearly normal kidney function.Signs and symptoms of acute kidney failure may include: Decreased urine output, although occasionally urine output remains normal Fluid retention, causing swelling in your legs, ankles or feet Shortness of breath Fatigue Confusion Nausea Weakness Irregular heartbeat Chest pain or pressure Seizures or coma in severe casesAcute kidney failure can occur when: You have a condition that slows blood flow to your kidneys You experience direct damage to your kidneys Your kidneys’ urine drainage tubes (ureters) become blocked and wastes can’t leave your body through your urineDiseases and conditions that may slow blood flow to the kidneys and lead to kidney injury include: Blood or fluid loss Blood pressure medications Heart attack Heart disease Infection Liver failure Use of aspirin, ibuprofen (Advil, Motrin IB, others), naproxen sodium (Aleve, others) or related drugs Severe allergic reaction (anaphylaxis) Severe burns Severe dehydration
https://www.mayoclinic.org/diseases-conditions/kidney-failure/symptoms-causes/syc-20369048