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Thirst is a late signal — by the time you feel it, mild dehydration has already begun, and darker urine or a dry mouth were the earlier clues. This dehydration guide teaches you to spot the early signs — headache, fatigue, dizziness, poor concentration — and how to rehydrate sensibly, including when plain water is not enough. Heavy or prolonged sweating loses salt as well as water, so electrolytes matter after long exercise or hot days. It also covers who dehydrates fastest (older adults, young children) and the urgent signs — confusion, fainting, no urine for hours — that need medical help. Educational guidance, not medical advice.
Recognise the early signs of low fluids and rehydrate sensibly — including when plain water is not enough.
Darker urine and a dry mouth usually arrive before thirst. Headache, tiredness, dizziness and poor focus follow as fluid dips further. Checking urine colour is the easiest daily gauge.
For sessions over about an hour, or very sweaty days, you also lose salt — plain water alone can dilute what remains. A sports drink, or water alongside salty food, restores balance better.
Confusion, fainting, no urine for eight or more hours, rapid heartbeat, or an inability to keep fluids down all warrant prompt medical attention — especially in children and older adults.
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