The normal concentration of blood potassium is 3.5-5.5mmol/L. When the blood potassium is lower than 3.5mmol/L, it is hypokalemia. The problems that are prone to occur with hypokalemia are mainly as follows: I. Low potassium is prone to muscle weakness, episodes of flaccid paralysis or even hypokalemic paralysis, which mainly affects the muscles of the four limbs and manifests itself as weakness of the muscles of the four limbs or inability to move, and it seldom involves the muscles of the head and neck. Severe low potassium can affect the electrophysiological activity of respiratory muscle and cardiac muscle, leading to paralysis of respiratory muscle and cardiac muscle, and respiratory cardiac arrest. Third, long-term low potassium can affect the secretion of insulin, so that blood glucose rises and even diabetes occurs. Fourth, long-term low potassium can cause hypokalemic nephropathy, resulting in decreased urine concentration function and easy occurrence of urinary tract infection.