This is a hormone made in the adrenal glands. It helps the body keep a normal amount of salt and water in the blood. This keeps the blood pressure at a normal level. High levels of aldosterone cause too much salt and water to be kept in the blood and causes high blood pressure. Low levels of aldosterone cause the kidney to remove too much salt and water from the blood and excrete it in the urine. This causes dehydration and low blood pressure. If the blood pressure drops too low, it can cause adrenal crisis and lead to a coma and possibly death.