Can Being Dehydrated Give You a Headacheに関する専門家の意見を丁寧に解説いたします。

Okay, don’t panic, but your brain is mostly water. Like, 73% water. That’s basically a water balloon packed with thoughts and bad decisions. When you get dehydrated, your brain actually shrinks a little. I’m not kidding.

Why does that matter? Because your brain is snugly wrapped inside your skull. When it shrinks, it pulls away from the bone, tugging on pain-sensitive membranes. That tug is your headache. It’s your brain throwing a tiny tantrum and saying, “Feed me, you negligent jerk!”

How Much Water Are We Talking?

You don’t need to wander the desert for three days to feel this. Even losing just 1-2% of your body’s water can trigger a headache. That’s like… skipping one glass of water after a workout. Or eating a salty pretzel without chasing it down.

Ever woken up with a pounding head after a night out? That’s dehydration plus a little alcohol revenge. Your body is crying, “Where’s the H2O, you monster?!” It’s not a hangover. It’s a betrayal of hydration.