Autoimmune diseases are complex and multifactorial, influenced by a combination of genetic predisposition, environmental triggers, and immune system dysfunctions. Functional medicine recognizes the uniqueness of each patient and considers factors such as diet, lifestyle, gut health, stress levels, and environmental exposures. Recent research suggests that intestinal permeability, often referred to as "leaky gut," may contribute to the development and progression of autoimmune conditions. When the intestinal barrier is compromised, harmful substances enter the bloodstream and trigger immune responses. Functional medicine aims to address these factors comprehensively, including chronic inflammation triggers like unhealthy eating habits, a sedentary lifestyle, obesity, high stress levels, and exposure to toxins such as mold, chemicals, or heavy metals. Rather than merely addressing symptoms or suppressing the immune system, functional medicine delves deeper to identify and target the root causes of autoimmune diseases.