Low 24-hour urinary potassium is considered to be related to hypoadrenocorticism, renal failure, renal tubular potassium excretion disorder and other diseases. 1. Hypoadrenocorticism: Hypoadrenocorticism can be seen as low blood sodium and high blood potassium by blood biochemistry examination, at this time, the 24-hour urine potassium can be seen to be on the low side; or the patient has gastrointestinal symptoms such as loss of appetite, vomiting diarrhea, etc., and the intake of potassium ions is too low, and the situation of low potassium in the 24-hour urine may also occur. 2. Renal failure: When renal failure occurs, patients may have water electrolyte and acid-base balance disorders, such as sodium retention and hyperkalemia. When the patient has potassium excretion dysfunction, low 24-hour urinary potassium may occur. 3. Renal tubular potassium excretion disorder: When renal tubules are damaged and potassium excretion dysfunction occurs, the potassium in urine will be relatively reduced, thus low 24-hour urine potassium may occur. There may be other reasons for low potassium in 24-hour urine. It is suggested that patients should go to regular hospitals for timely consultation, improve the examination to clarify the cause of the disease, and then give targeted treatment or therapy under the guidance of doctors.