Can Pure Water Kill You?
Yes, drinking extremely large amounts of pure water in a short time can be fatal. The condition is called water intoxication or hyponatremia. It occurs when blood sodium levels drop too low because excess water dilutes the salts in your body.
How Overhydration Affects the Body
Your kidneys can usually remove about 0.8 to 1.0 liters of water per hour. When you drink faster than this, fluid builds up in cells. Brain cells can swell, leading to headaches, confusion, seizures, coma, or death.
Safe Water Intake and Risk Factors
For most adults, drinking several liters spread throughout the day is safe. Risk increases during endurance sports, military training, or forced drinking contests. If you are concerned about your hydration habits, consult a healthcare professional or review guidance from a medical authority such as this overview on water and health.
