In the early stage of hypokalemia, symptoms such as muscle weakness, cardiac arrhythmia, and central nervous system dysfunction usually appear. 1. Muscle weakness: muscle weakness is a symptom that will appear in the early stage of hypokalemia patients. It is mainly characterized by limb weakness, delayed paralysis and loss of tendon reflexes, which can be further extended to the trunk and even the respiratory muscles, resulting in cessation of respiration. 2. Arrhythmia: early hyperkalemia patients may have premature beats, accompanied by paroxysmal atrial tachycardia and junctional tachycardia. 3. Central nervous system dysfunction: Hyperkalemia patients may have central nervous system dysfunction in the early stage, and may feel irritable, agitated and tired from time to time. If the above symptoms occur, it is recommended to go to the hospital in time to find out the specific causes of hyperkalemia, and carry out targeted treatment according to the specific causes.