Polycystic ovary syndrome (PCOS) is a common disease in obstetrics and gynecology. It is one of the most common diseases caused by abnormal endocrine metabolism in women of reproductive age. The causes of its occurrence can be divided into genetic and nongenetic types. In addition, most PCOS patients have functional abnormalities associated with thyroiditis, the most common of which is autoimmune thyroiditis (AIT). There are five types of AIT: Hashimoto''s thyroiditis (HT); Atrophic thyroiditis (AT); thyroiditis with normal thyroid function; Painless thyroiditis; Postpartum thyroiditis; However, no matter which type of disease it belongs to, it will pose a certain threat to the patient''s health. Therefore, women with PCOS disease should be examined for the presence of AIT as soon as possible.