Subacute thyroiditis is one of the common diseases in endocrinology and a kind of acute painful thyroiditis.In recent years,the incidence rate has gradually increased,with rapid onset and significant symptoms.Western medicine treatment has no specific medicine with relatively large side effects,and is also easy to relapse.Traditional Chinese medicine(TCM)has obvious advantages of the treatment of subacute thyroiditis.According to TCM,Subacute thyroiditis belongs to the category of “goiter”,which can be treated from the perspective of the dysfunction of Shaoyang pivot.Xiaochaihu Decoction is a representative prescription for Shaoyang disease.It has the functions including harmonizing yingfen and weifen,regulating spleen and stomach conditions,and dispersing liver and regulating qi,which is widely used clinically.It is effective in treating subacute thyroiditis and is worthy of promotion.