Hyperkalemia is a medical condition characterized by elevated levels of potassium in the blood. Potassium is an essential mineral that helps regulate heart function, muscle contractions, and nerve signals. Normal potassium levels range from 3.5 to 5.0 milliequivalents per liter (mEq/L), and levels above 5.0 mEq/L are considered hyperkalemic. Causes of hyperkalemia can include kidney dysfunction, certain medications, and excessive potassium intake from food or supplements. Symptoms may range from mild to severe and can include muscle weakness, fatigue, and irregular heart rhythms. Prompt diagnosis and treatment are crucial to prevent complications.