Dehydration happens when the body’s fluid balance is disturbed. Symptoms range from mild discomfort to life‑threatening signs. This page outlines common findings, groups at higher risk, and warning signs that should prompt urgent medical evaluation.
Fluid loss can result from many situations: vomiting or diarrhea, fever, heavy sweating, intense exercise, inadequate fluid intake, certain infections, or side effects of some medications. Infants and young children, older adults, people with chronic illnesses, and those exercising intensely are at higher risk.
Mild dehydration often causes thirst, dry mouth or lips, reduced urine output and darker urine, fatigue, lightheadedness and muscle cramps. More severe dehydration may show as decreased skin elasticity, sunken eyes, rapid heartbeat, low blood pressure, confusion or fainting — signs that require urgent assessment.
In infants, reduced wet diapers, lack of tears when crying, and marked irritability or unusual sleepiness are important clues. Older adults may not feel thirsty and chronic conditions can mask symptoms, so even subtle changes in behavior or urine output should be taken seriously.
Seek emergency evaluation if there is confusion, fainting, very little or no urine, ongoing vomiting or diarrhea preventing fluid intake, very high fever with rapid breathing or irregular pulse, or cool, clammy skin. These can indicate significant fluid loss and need prompt medical attention.
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