Water Intoxication

Water intoxication, also known as water poisoning or hyperhydration, is a life-threatening condition that occurs when a person drinks so much water in a short period that the kidneys cannot excrete it fast enough, leading to a dangerous dilution of blood sodium levels (hyponatremia). The kidneys can typically process about 0.8 to 1 liter of water per hour, so consuming significantly more than this overwhelms the body's ability to maintain electrolyte balance. When sodium levels in the blood drop too low, water moves into cells through osmosis, causing them to swell. Brain cells are particularly vulnerable because the skull limits their expansion, leading to increased intracranial pressure that can result in headaches, nausea, confusion, seizures, coma, and in the most severe cases, death. Notable cases have occurred during water-drinking contests, fraternity hazing rituals, and endurance events where participants over-hydrate without electrolyte replacement. A well-known 2007 case involved a woman who died after drinking approximately 6 liters of water in three hours during a radio contest. Military recruits have also been affected during training in hot climates when they followed overly aggressive hydration protocols. To avoid water intoxication, never drink more than 1 liter per hour, spread your intake evenly throughout the day, include electrolytes during prolonged physical activity, and use our calculator to determine a safe, personalized daily water target. The goal is consistent, moderate hydration, not extreme consumption in short bursts.