What symptom indicates severe dehydration?

Confusion is a significant symptom of severe dehydration because dehydration can lead to a decrease in blood volume, resulting in inadequate blood flow and oxygen to the brain. When the body is dehydrated, it may struggle to perform essential functions, including maintaining cognitive function. As fluid levels drop, neurological symptoms can manifest, including disorientation or confusion. This reflects a serious physiological response to dehydration, indicating that the body's systems are significantly stressed and not operating effectively.

In contrast, symptoms like increased energy would not be associated with dehydration; rather, individuals typically feel fatigued or lethargic. Pitting edema is usually linked to fluid overload or certain medical conditions affecting fluid balance, not dehydration. Wheezing can indicate respiratory issues rather than being directly related to the hydration status of the body. Therefore, confusion serves as a clear and alarming indicator of the body's critical need for rehydration.