If you have hyperkalemia, you have too much potassium in your blood. The body needs a delicate balance of potassium to help the heart and other muscles work properly. But too much potassium in your blood can lead to dangerous, and possibly deadly, changes in heart rhythm.
You experience any of these symptoms, which could be a warning sign of kidney disease. Unfortunately, some people have no symptoms of chronic kidney disease until the majority of kidney function is lost; that is why prevention -- through diet, exercise, and medication -- is key.