Sodium is everywhere and most of us have to restrict our use of salt to prevent cardiovascular disease. But there is a condition called hyponatremia where the sodium concentration of the blood is too low. It's been called Water Intoxication because it can happen when poorly trained weekend warriors-athletes drink too much water during an athletic event. Several people have died from exactly those circumstances. But hyponatremia can also occur during treatments for diseases or for other reasons. And when it does it can be a life-threatening situation. If the sodium levels in the blood drop too low the brain can swell which leads to coma and sometimes death. In this program we'll take a look at the circumstances that can lead to hyponatremia and explore the latest treatments.