Addison's disease is a disorder that occurs when the body produces insufficient amounts of certain hormones(aldosterone) produced by adrenal glands. Addison disease affects the balance of water, sodium, and potassium in the body, as well as the body’s ability to control blood pressure and react to stress. A deficiency of aldosterone in particular causes the body to excrete large amounts of sodium and retain potassium, leading to low levels of sodium and high levels of potassium in the blood. The symptoms include high blood pressure, low blood levels of potassium, and an abnormal increase in blood volume.