Chronic kidney disease
Chronic kidney disease, also known as chronic renal failure, chronic renal disease, or chronic kidney failure, is a slow progressive loss of kidney function over a period of several years. Eventually the patient has permanent kidney failure.
Chronic kidney disease is much more common than people realize, and often goes undetected and undiagnosed until the disease is well advanced and kidney failure is fairly imminent. It is not unusual for people to realize they have chronic kidney failure only when their kidney function is down to 25% of normal.