Hello, there are three reasons for hypokalemia: (1) Abnormal distribution of potassium across cells: alkalosis, application of β receptor agonist, barium poisoning and hypokalemic periodic paralysis.

(2) Insufficient potassium intake: seen in patients with fasting or anorexia.

(3) Excessive potassium loss

① Excessive kidney loss is the main cause of potassium loss in adults, which can be seen in the application of potassium-consuming diuretics, renal tubular acidosis, excessive mineralocorticoid and magnesium deficiency.

(2) Excessive potassium loss through extrarenal pathway is seen in gastrointestinal potassium loss and percutaneous potassium loss. Potassium is lost through gastrointestinal tract, such as diarrhea, vomiting, gastrointestinal decompression, intestinal fistula, etc. , which is the main cause of potassium loss in children; In the case of excessive sweating, potassium will be lost through the skin.