What the sing of kidney failure?

Often no early signs: The kidneys function is to excrete excess water, keep electrolytes like sodium and potassium in balance, stimulate red blood cell growth, and remove toxic byproducts from the body. Urine output may be increased or decreased, in which case there is often swelling of legs, and may cause some breathing issues. Lack of removal of wastes, causes nausea. See Kidney Failure: Signs, Symptoms, Causes & Stages - MedicineNet www.medicinenet.com/kidney_failure/article.htm