The normal value of blood potassium is 3.5-5.5 mmol/L. When the blood potassium concentration is lower than 3.5 mmol/L, it is called hypokalemia. There are many causes of hypokalemia, including the following: 1. Gastrointestinal diseases, when the patient cannot eat due to gastrointestinal diseases or vomiting or diarrhea, it will lead to insufficient intake or excessive excretion of potassium, resulting in hypokalemia. 2. This is due to adrenal hyperplasia or adenoma, which leads to excessive secretion of aldosterone. aldosterone has the effect of sodium retention and potassium excretion, so hypertension and hypokalemia can occur. 3, hyperthyroidism, hypokalemic paralysis can be induced in patients with hyperthyroidism after infection or eating large amounts of sugar and water, mostly in young men. 4, renal tubular acidosis, patients with renal tubular acidosis can develop potassium secretion and hydrogen secretion disorders, resulting in hypokalemia. 5, periodic paralysis, a small number of patients can appear potassium ion transfer to the cells, appearing hypokalemic paralysis. Periodic paralysis can be monogenic or can run in families.