“It is important to know whether kidney disease has developed suddenly (acute) or over the long term (chronic). Many conditions, diseases, and medicines can create situations that lead to acute and chronic kidney disease. Acute kidney injury, also called acute renal failure, is more commonly reversible than chronic kidney failure.
Acute kidney injury (AKI) is usually caused by an event that leads to kidney malfunction, such as dehydration , blood loss from major surgery or injury, or the use of medicines . Chronic kidney disease (CKD) is usually caused by a long-term disease, such as high blood pressure or diabetes , that slowly damages the kidneys and reduces their function over time.”
Cigna (cigna.com)