What are signs of dehydration aircrew should monitor?

• A. Thirst, dry mouth, dark urine, dizziness, fatigue, headache.
• B. Nosebleeds.
• C. Weight gain.
• D. Flushed skin only.

Answer: (A)

Dehydration shows up through a cluster of signs that reflect reduced body water: thirst and dry mouth are the body’s most immediate prompts to drink, and dark urine indicates concentrated urine from lower fluid intake. Dizziness, fatigue, and headache occur as blood volume and brain function are affected by dehydration. In an aircrew setting, cabin humidity is low, so staying vigilant for these signals helps maintain performance and safety.

Nosebleeds aren’t a standard dehydration sign; they can occur for other reasons like dry air or trauma. Weight gain isn’t dehydration-related; it suggests fluid retention or other issues. Flushed skin by itself isn’t a reliable dehydration indicator.