Hypokalemia is a clinical condition in which the patient’s blood potassium level is less than 3.5 mmol/L. For patients with hypokalemia, treatment is currently focused on removing the cause of the hypokalemia and treating it with potassium supplementation. There are two main causes of hypokalemia. First, the patient has low potassium absorption or intake. For this type of patients, they can be treated with dietary therapy, such as supplementing with foods rich in potassium, such as bananas. Secondly, patients lose too much potassium. For example, in some patients with kidney disease, excessive excretion of potassium causes hypokalemia. For such patients, it is generally recommended to actively treat the primary disease, and after the primary disease is controlled, the blood potassium is generally easier to recover. For those patients with hypokalemia for which no clinical cause can be found, the main treatment is intravenous potassium supplementation or oral potassium supplements. The electrocardiogram should be closely monitored during the treatment of hypokalemia to prevent irreversible damage to the heart muscle. In addition, when hypokalemia patients have digestive symptoms such as nausea and vomiting, abdominal pain and diarrhea, they can be treated with antiemetic and acid suppressant therapy. In conclusion, hypokalemia is treated by removing the cause of the disease and by treating the hypokalemia itself.