What is renal failure?

Renal failure refers to a condition in which the kidneys lose their ability to filter blood effectively, leading to the accumulation of waste products and excess fluids in the body. This impairment can result from various causes, including acute conditions that may occur suddenly or chronic issues that develop over time. When the kidneys are unable to perform their filtration responsibilities, it can result in serious health complications and requires immediate medical attention.

This definition highlights the critical role that kidneys play in waste management and fluid balance within the body, emphasizing the consequences of their failure. The other scenarios, such as fluid retention, overactivity, or stone formation, represent different kidney-related disorders but do not encapsulate the essence of renal failure itself, which is fundamentally about the ineffective filtering of blood.