Potassium is a very important cation in the human body and its main role is to maintain acid-base balance, to participate in energy metabolism and to maintain normal neuromuscular function. Potassium is found mainly in the cells, where it coordinates with the cells to maintain the acid-base balance of blood and body fluids, water and osmotic pressure. When the body is deficient in potassium, it causes weakness and a weakened heartbeat, and severe deficiency can lead to respiratory muscle paralysis. Potassium deficiency can also slow down gastrointestinal motility, leading to intestinal paralysis and symptoms such as anorexia, nausea and vomiting, and abdominal distention. Regardless of the cause of hypokalemia, potassium supplementation through medication is necessary, mainly intravenous potassium chloride injections and oral potassium chloride tablets such as potassium citrate, which can replenish the lack of potassium in the body. Some foods such as bananas and oranges are high in potassium, which can also properly replace the lost potassium.