DAO Deficiency, Histamine Intolerance, and Mast Cell Activation Syndrome (MCAS)
Understanding Histamine Dysregulation and Immune Overactivation This article provides a comprehensive and evidence-based overview of DAO deficiency, histamine intolerance, and Mast Cell Activation Syndrome (MCAS). It explores the underlying biological mechanisms, clinical manifestations, triggers, diagnostic approaches, treatment strategies, pharmacological interventions, nutritional considerations, and emergency warning signs associated with these complex histamine-related disorders. The content integrates current clinical understanding and reflects contemporary diagnostic concepts used in allergy, immunology, gastroenterology, and mast cell medicine. Introduction Histamine is a powerful biological chemical that plays an essential role in the human body. It participates in immune defense, stomach acid production, neurotransmission, regulation of blood vessels, and inflammatory responses. Under normal circumstances, histamine is tightly regulated through enzymatic breakdown and c...