Generally speaking, the level of potassium in the blood of a normal person is 3.5-5.5 mmol/L. If the clinical level of potassium in the patient’s blood is lower than 3.5 mmol/L, it can be called hypokalemia. Potassium ion is an important trace element in the human body, which is involved in various important vital activities of the body, such as various electrical activities, muscle activities, etc. The causes of hypokalemia are diverse and can be divided into the following aspects: First, the patient is a picky eater or has an unbalanced diet, resulting in insufficient potassium absorption and lower than normal potassium content; second, excessive potassium loss or consumption, such as acute gastroenteritis patients with severe diarrhea or vomiting, due to excessive loss of electrolytes, which can easily cause hypokalemia; third, some food poisoning can also cause patients with lower than normal potassium content. lower than normal potassium level. Fourth, some diseases, such as primary aldosteronism, can cause increased urinary potassium elimination, resulting in hypokalemia and hypertension together. The main clinical manifestations of hypokalemia may include muscle contraction weakness and, in severe cases, cardiac arrhythmias and conduction block. The diagnosis of hypokalemia is currently made by the level of potassium in the blood. In general, hypokalemia is a common electrolyte disorder with lower than normal potassium levels due to a variety of causes.