High blood potassium is medically known as hyperkalemia and is caused by decreased renal potassium excretion, excessive potassium intake, and tissue damage. It is recommended that patients with hyperkalemia should seek prompt medical attention. 1. Too much potassium enters the body, such as taking potassium-containing drugs by mouth or inputting too much potassium intravenously, as well as inputting large quantities of stored blood with a long storage period; 2. Decreased function of renal potassium excretion, such as acute or chronic renal failure; application of potassium-preserving diuretics such as spironolactone and aminopterin, as well as insufficient salt corticosteroid; 3. Intracellular potassium removal, such as hemolysis, tissue injury (e.g., crush syndrome), and acidosis. When patients have the above symptoms, they should go to the hospital in time for consultation, and early detection of the problem and early treatment, so as not to delay the condition.