Not all tumors of the adrenal gland will show low potassium, only cortical tumors will show low potassium, medullary tumors will not have low potassium. Because the adrenal cortex can secrete a hormone called aldosterone, when there is a tumor in the adrenal cortex, the secretion of aldosterone will increase. The main function of aldosterone is to protect sodium and excrete potassium, to keep the sodium ions in the blood vessels as much as possible within the body, and excrete the potassium ions out of the body, which will result in the change of low potassium in the long run, and at the same time, it can be accompanied by water and sodium retention, and the patients can have high blood pressure or oedema and other manifestations. In addition, all of them are combined with the change of elevated blood pressure, so it is necessary to monitor the blood pressure regularly, and it is necessary to further improve the related hormone series examination, such as the examination of blood aldosterone, the examination of blood catecholamines, and the examination of cortisol rhythms. For the diagnosis of low potassium caused by adrenal tumor, it can be completely cured through surgical treatment. However, it is necessary to further identify other causes of hypokalemia, such as periodic paralysis, but the cause of hypokalemia is not related to excessive aldosterone, i.e. cortisol tumors.