Which type of diarrhea is characterized by increased secretion of fluid?

• A. Chronic diarrhea
• B. Acute diarrhea
• C. Osmotic diarrhea
• D. Exudative diarrhea

Answer: (B)

The main idea is that fluid-rich diarrhea comes from the gut actively secreting electrolytes and water into the lumen. When enterocytes release chloride and other ions, water follows, creating large-volume, watery stools. This secretory process is typical of acute infectious or toxin-mediated diarrhea, where the rapid onset is driven by secretagogues that overwhelm absorption.

That’s why the best choice in this set is the one describing acute diarrhea—it aligns with the rapid, secretion-driven watery stools seen with many acute infections or toxins. The other patterns involve different mechanisms: osmotic diarrhea results from nonabsorbed solutes pulling water into the lumen and is usually reduced by fasting; exudative diarrhea comes from mucosal inflammation with blood and mucus; chronic diarrhea refers to duration (lasting longer than a few weeks) and can involve various mechanisms, not specifically secretion.