Here's how to treat dehydration ... you become dehydrated. Dehydration is when you're losing or using more fluids than you are taking in. The human body loses fluids in many ways, such as sweating ...

The best way to treat and prevent dehydration? Drinking enough water, says Dr. Hames. Your exact hydration needs will depend ...

You may also feel fatigue, dry mouth, and confusion. Drinking water is the best way to treat a headache from dehydration, but it's also a good idea to rest and seek shade until you feel better.