Symptoms of potassium deficiency may include limb weakness, dyspnea, precordial discomfort, and loss of consciousness. There is individual variability in the symptoms of potassium deficiency. Potassium deficiency can affect the neuromuscular system, causing generalized weakness and limb weakness. In severe cases, it can involve the respiratory muscles, resulting in wheezing, dyspnea and even asphyxia, which can be life-threatening and can lead to death. Potassium deficiency can affect the heart, can appear ventricular tachycardia and other serious arrhythmia, serious cases of ventricular fibrillation, cardiac arrest, may be life-threatening, symptoms can be manifested as discomfort in the precordial region, pain, profuse sweating, sudden loss of consciousness. Patients with hyperkalemia or with the above symptoms should go to the hospital in time and be treated under the guidance of doctors to avoid delaying their condition.