Always a Battlefield Inside? Crohn's Disease, an SOS from Your Small Intestine

In modern medicine, inflammatory bowel disease, particularly Crohn's disease, directly aligns with the crisis of the small intestine described in Donguibogam. Crohn's disease is a condition involving chronic inflammation throughout the digestive tract, including the small intestine, and is understood as an autoimmune disease where the immune system attacks the body's own intestines. It is much like immune cells, which should be the protectors of our body, mistakenly destroying their own home. What makes this disease serious is that inflammation penetrates deep into the small intestinal mucosa to form ulcers and thickens the intestinal barrier, severely impairing the process of separating the clear from the turbid—namely, nutrient absorption and waste excretion. The small intestine is lined with numerous villus structures that expand the surface area for absorbing nutrients. When the villus structures are damaged by inflammation, nutrients cannot be properly absorbed regardless of how wholesome the food is, ultimately leading to systemic symptoms such as malnutrition, weight loss, and chronic fatigue. Furthermore, inflammation can penetrate the intestinal barrier and spread to adjacent organs or skin, creating an abscess or a fistula. When stenosis develops and narrows the intestinal lumen, the passage of food becomes difficult, triggering severe abdominal pain and vomiting. While genetic factors, environmental influences like a Westernized diet and smoking, and gut dysbiosis are known to act in combination to bring about the condition, the exact cause has not yet been identified. What remains clear is that recognizing the SOS signals sent by the small intestine early on and managing them proactively is essential. Intestinal health extends beyond simple digestion, exerting a profound influence on the immunity and vitality of the entire body.