In kidney failure, the kidneys lose their ability to filter enough waste products from the blood and to regulate the body's balance of salt and water. Eventually, the kidneys slow their production of urine, or stop producing it completely. Waste products and water accumulate in the body.
This can lead to potentially life-threatening complications. Excess fluid can accumulate in the lungs and extreme changes in blood chemistry can affect the function of the heart and brain. There are three general categories of kidney failure (also called renal failure).
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