Kidney failure can mean a lot of different things, but in short, it means that the kidneys aren’t working as they should. This could be because the kidney isn’t receiving enough blood, because of a condition like high blood pressure or high blood sugar, or because of a kidney stone or scar tissue on the kidney.
When the kidneys don’t function properly, waste builds up and the following symptoms can occur: weakness, fatigue, shortness of breath, and confusion. Sometimes there are no symptoms. But if potassium pools in the bloodstream, kidney failure can cause arrhythmia and even death.