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Your brain runs on a precise chemical balance. It uses water mixed with sodium, potassium, and magnesium to regulate nerve signals and move fluid between cells. When you exercise, sit in the heat, or simply forget to drink, that balance breaks. The result is a throbbing head and deep fatigue. It is not a random pain. It is a biological warning light. Research in the Journal of Evaluation in Clinical Practice proved what many suspected: increasing daily water intake actively drops how often you get headaches. Not every headache is fixed with a glass of water. Pounding pain that refuses to leave means you need a doctor. But for most of us, the cure is right in the tap.