It’s not like a normal “I’m dehydrated” headache. A dehydration headache usually feels sharp and comes with a dry mouth. An overhydration headache feels more like a heavy, throbbing pressure behind your eyes or at the base of your skull. You might also feel bloated, nauseous, or just… sloshy.
Think of it like this: your body is a Goldilocks. Not too little, not too much—just right. When you force down water past the point of comfort, your body taps the brakes. Your kidneys can only process about one liter per hour. Beyond that, you’re just storing water in places that don’t want it.
Remember that time you tried to water a houseplant that was already soaking wet? The roots rotted. Your brain cells are a bit like those roots. They don’t appreciate being waterlogged either.
When Do People Usually Overdo It?
Ironically, it often happens during good intentions. You know the scene: you start a new diet, or you attend a sweaty spin class, and you chug a huge bottle of water immediately. Then you feel proud—and then you feel a headache creeping in.
Another classic culprit: drinking contests or games. I once saw a guy at a backyard BBQ try to chug a gallon of water in ten minutes for a bet. He won the bet, but spent the rest of the afternoon with a screaming headache and a trip to the bathroom. Not the flex he thought it was.
Even marathon runners get caught. They sweat out a ton of salt, then replace it with only plain water. That’s a recipe for a sodium crash and a nasty post-race headache. For active folks, the fix is simple: use an electrolyte drink sometimes, not just plain H2O.
Is There Such A Thing As Too Much Water Intake at Tammy Pough blog
