Aldosterone is a hormone produced by the adrenal glands, which are located on top of the kidneys. It plays a crucial role in regulating blood pressure and maintaining the balance of electrolytes in the body, particularly sodium and potassium. By promoting sodium reabsorption in the kidneys, aldosterone helps to retain water, which increases blood volume and, consequently, blood pressure. When the body experiences low blood pressure or low sodium levels, the secretion of aldosterone increases. This process is part of the renin-angiotensin-aldosterone system (RAAS), which helps to control blood pressure and fluid balance. Abnormal levels of aldosterone can lead to health issues, such as hypertension or Addison's disease.