Let’s get weird. Water is great. Too much water? dangerous. Your body has a delicate salt-and-fluid balance. Chug beyond your limit, and you dilute the sodium in your blood. This is called hyponatremia. And yes, it gives you a headache.
Your brain cells start to swell. No joke. They puff up like tiny, angry sponges. That pressure inside your skull? That’s your headache. It’s your brain screaming, “Stop being a hero with that water bottle!”
How Much Is “Too Much”?
It’s not a magic number. But drinking more than a liter per hour for several hours is a big red flag. Your kidneys can only process about 800-1,000 milliliters of water per hour. Everything else? It sloshes around, messing up your salts.
Think you’re safe because you’re sweating? Think again. Exercise makes it worse. You lose sodium through sweat, then you chug plain water on top of that. It’s like pouring gas on a greasy fire. Your head will thud. You might even feel dizzy or nauseous.
