What are thyroid diseases?

Thyroid gland is the largest endocrine gland in the human body. Its main function is to synthesize and secrete thyroid hormone, which is also one of the most important hormones in the human body. Therefore, once thyroid disease occurs, it will directly affect people's health. There are many thyroid diseases, such as hypothyroidism, thyroid nodules, hyperthyroidism, thyroid cancer, etc.