Can Drinking Too Much Water Cause a Headache

Can Drinking Too Much Water Cause a Headache

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Your brain is a diva—it likes things just right. When you drink too much water too fast, you mess with the sodium balance in your blood. Sodium is like the bouncer at a club; it helps keep fluid levels in check. Too much water dilutes that bouncer’s power, and fluid starts sneaking into your brain cells.

Imagine your brain cells as tiny balloons. Normally, they’re plump and happy. But when they get flooded, they swell—and your skull, being a cranky landlord, has no extra space. That pressure? Yep, that’s your headache. It’s like your brain is throwing a tiny tantrum, saying, “Stop breaking the lease!”

The ‘Golden Gulp’ mistake

We’ve all done the “Golden Gulp”—that desperate, throat-burning chug after a dry workout. It feels heroic, like you’re putting out a fire in your throat. But your kidneys are slow-pokes; they can only process about one liter per hour. Go faster, and you’re basically waterboarding your insides.

I once did this after a long bike ride. I felt so virtuous, like a cactus finally getting a monsoon. Twenty minutes later, my head throbbed, and I felt queasy. My partner looked at me and said, “You look like a sad, overwatered houseplant.” He wasn’t wrong.

渡辺 美咲
著者

渡辺 美咲

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