Pathophysiology of Diarrhea (Different Types of causes for Diarrhea)
Diarrhea is the frequent passage of loose, watery stools. It can result from various underlying conditions that disrupt the normal balance between water and electrolyte absorption and secretion in the intestines.
Key Pathophysiological Mechanisms of Diarrhea:
Osmotic Diarrhea: Occurs when unabsorbed solutes in the intestine draw water into the lumen. Examples include lactase deficiency leading to lactose malabsorption and ingestion of non-absorbable substances like sorbitol2.
Secretory Diarrhea: Results from excessive secretion of water and electrolytes into the intestinal lumen. Conditions like cholera cause secretory diarrhea through toxins that promote cAMP-mediated chloride and water secretion2.
Inflammatory Diarrhea: Caused by diseases that result in mucosal damage, leading to the leakage of blood, mucus, and pus3. Conditions such as inflammatory bowel disease (IBD) and infections like Shigella can cause this type of diarrhea3.
Motility-related Diarrhea: Occurs when intestinal transit time is altered, leading to insufficient absorption of nutrients and water. Conditions like irritable bowel syndrome (IBS) and diabetes mellitus can accelerate gastrointestinal transit.
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