Low 24-hour urinary potassium indicates that it may be due to insufficient blood potassium in the body or decreased potassium excretion by the kidneys. 1. Insufficient blood potassium: Common causes include insufficient intake (e.g. coma, prolonged anorexia) and excessive excretion (e.g. vomiting, diarrhea, gastrointestinal drainage, etc.). 2. Decreased renal excretion of potassium: When renal function is impaired for various reasons, it can lead to a decrease in glomerular filtration rate, and a decrease in the excretory function of the kidneys, which will lead to a decrease in the excretion of potassium, thus leading to a low 24-hour urine potassium. If you have low potassium in 24-hour urine, you should consult a doctor in time and take treatment under the guidance of a professional physician, rather than dealing with it blindly on your own, which may cause adverse consequences.