Thyroid fibroid tumors occur more frequently in women, especially in women younger than 40 years of age, and the cause is considered to be related to changes in hormone levels in the body. In addition, there is a family genetic predisposition, and exposure to specific radioactive substances affects the metabolism of thyroxine in the body, resulting in secondary thyroid glandular or follicular tumor-like hyperplasia and the formation of a substantial tumor, which is mainly characterized by a pre-cervical mass with painful symptoms, or even bleeding in the gland or tumor, and sudden pain and a gradually increasing mass. The mass may appear as an intact mass on ultrasound. After the diagnosis of thyroid fibroid tumor, surgery should be chosen in a timely manner and pathological examination should be performed because although it is a common benign lesion, there is a possibility of malignancy and regular postoperative review is needed.