HealthMap

Microscopic Colitis and Chronic Diarrhea

• Definition and Overview
• Microscopic colitis is an inflammatory bowel condition characterized by persistent, watery chronic diarrhea.
• Unlike other inflammatory bowel diseases, the colon appears normal during a standard colonoscopy, and the inflammation can only be seen under a microscope through tissue biopsies.

• Primary Types of Microscopic Colitis
• Collagenous colitis: Involves the accumulation of a thick layer of collagen beneath the inner lining of the colon.
• Lymphocytic colitis: Involves an abnormal increase in white blood cells (lymphocytes) within the surface lining of the colon.

• Underlying Causes and Contributing Factors
• Immune system dysfunction: An abnormal mucosal immune response to luminal antigens, such as normal gut bacteria, dietary proteins, or toxins.
• Medication side effects: Frequently triggered or aggravated by certain drugs, particularly NSAIDs, proton pump inhibitors (PPIs), statins, and selective serotonin reuptake inhibitors (SSRIs).
• Bile acid malabsorption: Frequently coexists with microscopic colitis, further exacerbating secretory diarrhea.
• Nutritional and biochemical imbalances: Deficiencies in key minerals, trace elements, and vitamins can impair mucosal healing and worsen gut inflammation.

• Mechanism of Chronic Diarrhea
• The localized inflammation damages the normal absorptive capacity of the large intestine.
• Instead of absorbing water and electrolytes, the inflamed colon secretes fluids, leading to frequent, non-bloody, watery bowel movements.

• Nutritional and Dietary Considerations
• Food sensitivities: Identifying and eliminating trigger foods (such as gluten, dairy, or specific chemical additives) is critical.
• Targeted supplementation: Restoring optimal nutritional status—particularly addressing deficiencies in zinc, magnesium, selenium, and vitamins A, D, and C—supports immune regulation and mucosal tissue repair.
• Gut microbiome support: Reducing intestinal dysbiosis helps lower localized inflammatory triggers.