Mortality from acute diarrhea is usually primarily due to what?

• A. Bacterial infection
• B. Fluid loss and dehydration
• C. Sepsis
• D. Malnutrition

Answer: (D)

The main concept is that death from acute diarrhea is driven by fluid and electrolyte losses leading to dehydration and reduced blood flow, not by the infection itself. Diarrhea can cause rapid, large losses of water, sodium, bicarbonate, and other electrolytes. If these losses aren’t replaced quickly, intravascular volume drops (hypovolemia), blood pressure falls, organ perfusion declines, and shock can develop. This sequence is what commonly leads to mortality, especially in young children and older adults. Malnutrition heightens risk by blunting reserve and immune response, and severe dehydration can be more dangerous in malnourished individuals, but the proximate cause of death remains the severe fluid and electrolyte loss. Effective rehydration—oral when possible or IV for severe cases—along with electrolyte management, is the key to reducing mortality from acute diarrhea.