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| | Dehydration Symptoms - Benefits of Drinking Water - Signs of Fluid Imbalance |
 | | Signs of severe dehydration, a potentially life-threatening condition, include lethargy, headaches, dry lips, decreased urination, a burning sensation in the stomach, an abnormally fast heart rate, inability to concentrate and fatigue. |
 | | Combined water and sodium deficit (isotonic dehydration): Both salt and water are lost proportionately (e.g., because of diuretics or severe or prolonged diarrhea or vomiting). |
 | | Excess water and salt retention: Both water and salt are retained inappropriately (e.g., because of heart or liver failure). |
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