Patients with advanced cirrhosis may experience symptoms such as muscle weakness and cardiac arrhythmias when they are deficient in potassium, or some patients may have no obvious symptoms. Potassium deficiency may be due to insufficient potassium intake, excessive potassium excretion, and abnormal potassium distribution, which in turn leads to hypokalemia. Hypokalemia is defined as serum potassium less than 3.5 mmol/L. When hyperkalemia occurs, the earliest symptom is muscle weakness, which is mainly dominated by limb weakness, flaccid paralysis, loss of tendon reflexes, and further development may extend to the trunk, even affecting the respiratory muscles and causing respiratory arrest. If acute hypokalemia occurs, it will easily lead to cardiac arrhythmia, which can be manifested by anterior systole, tachycardia, and even ventricular fibrillation. If patients have symptoms related to hyperkalemia, it is recommended to go to regular hospitals in time for consultation, and after clarifying the cause of the disease, carry out targeted treatment under the guidance of doctors.