What is high potassium mean?

High potassium, or hyperkalemia, refers to an elevated level of potassium in the blood, typically above 5.0 milliequivalents per liter (mEq/L). Potassium is essential for normal cell function, particularly in heart and muscle cells, but excessive levels can disrupt heart rhythms and lead to serious health issues. Causes of high potassium can include kidney dysfunction, certain medications, and excessive potassium intake. Symptoms may range from mild to severe and can include muscle weakness, fatigue, and irregular heartbeats.