Do you have high blood pressure? That can cause headaches, and fluid intake could temporarily raise your vascular volume, especially if you are eating high sodium/low potassium... Not to say you should not drink water, by any means, just pace yourself.
I'm trying to up my water intake. I drink maybe 16oz a day, if that, and a glass or two of milk and a can of diet soda.
I don't want to become dehydrated as the weather is only getting hotter, and anyways I know that you're supposed to drink at least 32-64oz a day.
But once I get past 16oz, I start to get a headache. I find this to be odd. The water I drink is either from a filtered dispenser (at work) or bottled, not tap, so I don't think it's anything IN the water that's causing it.
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