What is a common cause of dehydration in children?

• A. Acute gastroenteritis with diarrhea or vomiting
• B. Chronic diarrhea
• C. Dehydration from fever alone
• D. Urinary tract infection

Answer: (A)

In children, dehydration is most commonly due to fluid and electrolyte losses from the gastrointestinal tract during an episode of acute gastroenteritis, especially when there is diarrhea or vomiting. Kids have a higher body water percentage and rely on regular oral intake; when they have GI losses, they can become dehydrated quickly and show signs like dry mucous membranes, decreased urine output, and lethargy. The combination of diarrhea or vomiting directly reduces both water and electrolytes, making this the typical and most frequent cause.

Fever alone can contribute to some fluid loss through sweating, but it is usually not the primary driver of dehydration in kids. Chronic diarrhea can cause dehydration as well, but it tends to be less acutely common than an acute GI illness. A urinary tract infection, by itself, does not typically lead to rapid dehydration unless it progresses to systemic illness or there is poor intake for other reasons.