Thyroid tumor examination includes ultrasound, CT, nuclear scan, puncture biopsy and laboratory tests. 1. Ultrasound: Ultrasound is one of the most sensitive methods to check the morphological abnormality of the thyroid gland, which can relatively accurately detect the morphology of the thyroid gland, the size and the result of the thyroid gland, and also evaluate the infiltration of the tumor in the thyroid gland. 2.CT: CT can accurately determine the boundaries of the tumor, the infiltration and metastasis of the tumor tissue in the thyroid gland and surrounding tissues. At the same time, it can understand the metastatic spread of the thyroid tumor to the retrosternum, mediastinum, hyoid bone and the periphery of the esophagus. 3. Nuclide scan: it can locate the position of the thyroid gland, ectopic thyroid gland, metastasis and residual tumor tissues, and the overall radioiodine scan can show the metastatic foci of the tumor and the lymph nodes involved. Nuclide scan is an important tool for differential diagnosis of thyroid tumor. 4. Puncture biopsy: Pathological biopsy can provide reliable cytology, pathology, immunohistochemistry diagnostic basis, and it is an accurate method to finally evaluate whether the thyroid nodule is malignant or not. 5. Laboratory tests: serum calcitonin assay can assist in the diagnosis of medullary thyroid carcinoma; thyroglobulin can be elevated in many thyroid tumors. There are many auxiliary tests for thyroid tumor, and the advantages and focuses of different tests are different, so it is recommended to consult the hospital in time, choose the appropriate auxiliary tests under the guidance of specialists, and take treatment measures in time with clear diagnosis results.