Causes of hypokalemia include dietary abnormalities, excessive secretion of adrenal cortex, vomiting and diarrhea, or excessive intracellular potassium intake. 1. Dietary abnormality: When the patient is picky about food for a long period of time or in a state of excessive starvation, it may lead to insufficient intake of potassium and cause hypokalemia. 2. Excessive secretion of adrenal cortex: When the patient suffers from various diseases such as aldosteronism or nephrolithiasis, it may lead to excessive secretion of adrenal cortex, resulting in excessive discharge of potassium, which may also cause hypokalemia. 3. Vomiting and diarrhea: when the patient suffers from enteritis or is stimulated by cold air, he/she may suffer from vomiting and diarrhea, which may also lead to a large amount of potassium loss and cause the above situation. 4. Excessive potassium entering the cells: when metabolic alkalosis occurs; or when a large amount of glucose solution is infused, it will cause a large amount of potassium ions to enter the cells, which can also cause the occurrence of hypokalemia. The causes of hypokalemia are complicated, patients should go to the hospital in time and choose the appropriate method of treatment.