Gut health affects thyroid function by influencing nutrient absorption, immune regulation, inflammation, thyroid hormone conversion, and autoimmune risk, especially in conditions like Hashimoto’s. The thyroid is connected to the gut, immune system, stress response, liver, and nutrient status. If the gut is inflamed or dysfunctional, thyroid health often suffers.This is especially true for people with Hashimoto’s thyroiditis, where the immune system is involved.