Leaky Gut Syndrome, or increased intestinal permeability, occurs when the lining of the small intestine becomes compromised, allowing toxins, microbes, and undigested food particles to enter the bloodstream. This can trigger immune responses, inflammation, and contribute to food sensitivities, autoimmune conditions, skin issues, and neurological symptoms. Causes include poor diet, chronic stress, infections, medications, and imbalances in gut bacteria. Symptoms often include bloating, fatigue, joint pain, and brain fog. Functional medicine approaches focus on repairing the gut lining with targeted nutrition, probiotics, stress reduction, and lifestyle changes to restore balance and long-term health.