Causes of potassium deficiency include decreased intake, excessive loss, and increased entry of potassium into the cells. 1. Decreased intake: insufficient potassium intake due to digestive tract obstruction, prolonged fasting, coma, anorexia nervosa, etc. 2. Excessive loss: Severe vomiting, diarrhea, continuous gastrointestinal decompression, enterocutaneous fistula, etc. Loss of large amounts of potassium from the digestive tract route. In addition to this, prolonged application of furosemide or thiazide diuretics, renal tubular acidosis, polyuric phase of acute renal failure, and excessive saline corticosteroids lead to excessive renal excretion of potassium. 3. Increased access to intracellular potassium: the transfer of potassium to the tissues is seen in large infusions of glucose and insulin, or in those with metabolic or respiratory alkalosis. In the presence of the above factors and symptoms of hyperkalemia, immediate hospitalization is recommended.