One of the most likely causes of elevated potassium levels is kidney disease. One of the kidney functions includes balancing the level of potassium in our body. When we intake potassium from our food, our kidney filters it from the food and discards it along with urine.  If you are suffering from kidney disease, it can result in increased potassium levels in your body. Another likely cause of elevated potassium levels in your body is a high potassium intake.  If your regular food intake consists of food items high in potassium, then it can also result in increased potassium levels. If you are on some medication and have an elevated potassium level in your body, then chances are any medicines are causing your renal function to stop.