Ultrasound examination of the thyroid gland: Ultrasound can clearly identify whether the thyroid mass is cystic or substantial. Color ultrasound can also observe the blood flow of the mass, which can provide reference for the diagnosis of benign and malignant tumors, and those with abundant blood flow may have malignant changes. 2. Measurement of thyroid 131 iodine uptake rate: regardless of benign or malignant tumors, thyroid 131 iodine uptake rate is mostly normal, while functional autonomous thyroid adenoma can be high. Thyroid nuclear scan: Thyroid adenoma and a few thyroid cancers may appear as hot nodules or warm nodules, while thyroid cysts, thyroid adenoma cystic changes or internal bleeding may appear as cool nodules or cold nodules, generally with clear contours and regular borders. 4. All functions of the thyroid gland are mostly normal. 5.X-ray examination of neck: when the thyroid tumor is huge, the trachea can be seen to be compressed or displaced, and calcified images can be seen in some of the tumors. The lymphography of thyroid gland shows round filling defect in the reticular structure with regular edge and complete image of surrounding lymph nodes.