Which is a mild dehydration symptom?

Which is a mild dehydration symptom?

• A. Sticky, dry mouth
• B. Headache
• C. Fatigue
• D. Lightheaded

Answer: (C)

Fatigue is a hallmark of mild dehydration because even a small drop in fluid volume reduces blood flow and the body's ability to transport oxygen and nutrients to cells, which drains energy and leaves you feeling tired during activity. The other signs can occur with dehydration but are less specific to its mild form: a dry mouth is a localized symptom that can arise from other factors, while headache and lightheadedness tend to appear when fluid loss is more substantial and brain perfusion is more affected.

Fatigue is a hallmark of mild dehydration because even a small drop in fluid volume reduces blood flow and the body's ability to transport oxygen and nutrients to cells, which drains energy and leaves you feeling tired during activity. The other signs can occur with dehydration but are less specific to its mild form: a dry mouth is a localized symptom that can arise from other factors, while headache and lightheadedness tend to appear when fluid loss is more substantial and brain perfusion is more affected.