Volume-dependent hypertension is an increase in blood pressure due to blood volume expansion and is a type of renal hypertension. Renal hypertension is categorized into two types according to the pathogenesis, volume-dependent and renin-dependent. Volume-dependent hypertension occurs when the renal parenchyma is damaged and the ability of the kidneys to process sodium and water is weakened. When sodium intake exceeds the body’s excretion capacity, sodium and water retention occurs, and the sodium and water retention in the blood vessels causes the blood volume to expand, and hypertension occurs. The levels of renin and angiotensin in patients with volume-dependent hypertension are usually low, and lowering of blood pressure can be achieved by restricting the intake of water and salt, or by removing excess water and salt from the body through dialysis. When symptoms of elevated blood pressure occur, prompt medical attention is recommended to avoid irreversible damage caused by high blood pressure.