During recent forty years, thyroid cancer rates had gone up constantly. Generally, the best treatment for thyroid benign or malignant nodules is surgery, but surgery is very costly. Thyroid health affected mental health, while mental health affected suicide rate. During the recent 15 years, American suicide rate also went up. This paper was about how to eat, exercise, and improve mental health to better thyroid health and consequently improve mental health. To understand this topic, this researcher went through more than five thousand threads/emails online long-term thyroid cancer survivors group. Among the survivors, this researcher picked out five typical cases who survived thyroid cancer from eight years to close to 50 years. From these five cases’ discussion, this researcher tentatively summarized the best practices in diet, exercise and improving mental health in improving thyroid health and consequently keeping thyroid cancer in remission.