Hypernatremia is the medical term used to describe having too much sodium in the blood. Sodium is an important nutrient for proper functioning of the body. Most of the body’s sodium is found in the blood. It’s also a necessary part of the body’s lymph fluids and cells. In many cases, hypernatremia is mild and doesn’t cause serious problems. However, in order to prevent or reverse problems caused by hypernatremia, it’s important to correct high sodium levels. Read on to learn more about the role of sodium and when high levels may result in a medical emergency