A condition that occurs when the body loses more water than it takes in, resulting in insufficient body water for normal physiological function.
Water is continuously lost through urine, sweat, breathing, and stool. Dehydration can develop when fluid intake is inadequate or when fluid losses become excessive, such as with vomiting, diarrhea, fever, heavy sweating, or certain illnesses and medications.
Symptoms can include thirst, dry mouth, reduced urination, dizziness, weakness, and fatigue. Severe dehydration can impair circulation and organ function and may become life-threatening.
QUICK FACT
Thirst is not always an early or reliable sign of dehydration, particularly in some older adults and people who are ill.
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