The performance of potassium deficiency in human body is related to the severity of potassium deficiency. Mild potassium deficiency can be asymptomatic, while severe potassium deficiency can be manifested as abnormalities in skeletal muscle, digestive system, urinary system, circulatory system, central nervous system, etc., such as muscle weakness, abdominal distension, constipation, etc., which may be fatal in severe cases. 1. Skeletal muscle: muscle weakness, dysphagia, respiratory muscle paralysis, etc. 2. Digestive system: weakened intestinal peristalsis, intestinal paralysis, nausea and vomiting, abdominal distension, constipation, etc. 3. Urinary system: prolonged potassium deficiency can lead to degeneration and necrosis of renal tubular epithelial cells, decrease of urinary concentrating function, and symptoms such as thirst and polyuria can occur. 4. Circulatory system: ventricular premature beats, atrial premature beats, severe conduction block, atrial fibrillation, ventricular tachycardia, and even induce ventricular fibrillation. 5. Central nervous system: depression, unresponsiveness, drowsiness and coma. Patients with potassium deficiency should be treated under medical supervision.