Early dehydration can look pretty ordinary: thirst, darker urine, dry mouth, headache, fatigue, and maybe feeling a little lightheaded. The body usually sends the message before things get severe.
If someone is vomiting, has diarrhea, is overheated, or is not drinking enough, the warning signs can show up faster. Children and older adults can get into trouble sooner.
The practical fix is to drink fluids earlier rather than waiting to feel awful. By the time you are very thirsty, you are already behind.
Sources
This is general information, not professional medical advice. For decisions about your situation, talk to a qualified professional.
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