What can cause high potassium levels?

High potassium levels may be a sign that the kidneys are not functioning properly or that a medication is preventing the kidneys from regulating potassium levels. High potassium levels can also occur when too much potassium is released into the blood from inside cells (where it is normally stored), usually as a result of burns or other injuries as well as conditions that affect the acid-base balance in the body. In many cases, there are multiple contributing factors. Increasing potassium intake from diet or supplements rarely causes hyperkalemia alone, but, when paired with reduced kidney function or other contributing factors, increased intake may spur a rise in blood levels of potassium.