Thyroid cancer is usually divided into five grades. 1. Grade I: usually round or oval echogenic nodules with regular shape and no blood flow signal inside. It is mostly seen in thyroid cysts and thyroid tumor with intracapsular hemorrhage. 2. Grade II: usually a mixed cystic-solid echogenic nodule with blood flow signal in the solid part. It is usually seen in follicular adenoma and adenomatous nodule. 3. Grade III: It is a homogeneous solid echogenic nodule with regular shape, sometimes microcalcification is seen in the capsule or nodule, and internal blood flow is abundant. It is more common in follicular adenoma, adenomatous nodule and differentiated carcinoma. 4. Grade IV: solid echogenic nodule with irregular shape, sometimes microcalcification can be seen in the capsule or nodule, and abundant internal blood flow. It is more common in differentiated carcinoma. 5. Grade V: solid echogenic nodule, irregular shape, sometimes microcalcification is seen in the capsule or nodule, and internal blood flow is abundant. It is common in differentiated carcinoma. It is suggested that patients presenting with thyroid cancer can be treated under the guidance of professional doctors.