anyone have any thoughts on why his Potassium was elevated. I am worried that there is more going on and it is being overlooked. His BP has been up since this started. Today it is 154/104. His bp has always been great. When he went to the ER 2 days ago, his potassium was up, his bp was up and his legs were swollen. I just dont feel like we are getting anywhere. When I asked why his potassium was up they just said, "Good questions". He is being rechecked today but I am just worried. They wont have the results back until Monday. mary Dr Guest. What are the possible causes of elevated potassium?