Which symptom is a common GI cause of dehydration in pediatric patients?

• A. Vomiting
• B. Fever
• C. Toxins
• D. Diarrhea

Answer: (A)

Fluid loss from the gastrointestinal tract is a major way dehydration develops in children. Vomiting directly ejects stomach fluids, so it can rapidly reduce a child’s circulating volume. Kids have smaller fluid reserves, so even brief bouts of vomiting can lead to dehydration quickly, especially when it makes it hard to keep down enough fluids for rehydration. While diarrhea also causes dehydration by losing fluids in stool, vomiting is a particularly common and immediate driver of dehydration in pediatric GI illnesses because it rapidly depletes the body's water and electrolytes. Fever and toxins don’t by themselves represent fluid loss, whereas diarrhea is a separate cause of dehydration, but vomiting best fits the symptom-driven picture of rapid fluid loss.