The body's "water ecosystem" is regulated by responses to salt and water levels. [iStockphoto] Dehydration can be defined as the loss of intracellular body water. To understand the causes it's ...

A dehydration headache can happen when your body needs more fluid. Thirst is usually one of the first symptoms, but dehydration can also cause headache, dry mouth, fatigue, and changes to urine ...

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