Solid thyroid nodules may be benign or malignant. 1. Benign nodules: If the ultrasound examination of thyroid nodules suggests solid thyroid nodules, the nodules have clear boundaries, good mobility and are not rich in blood, indicating that the nodules tend to be benign. In this case, it is generally necessary to review the thyroid ultrasound regularly for 3 to 6 months to monitor the changes of the nodule, and generally do not need to carry out pathological examination. 2. Malignant nodules: If the thyroid ultrasound suggests solid thyroid nodules with unclear borders, rich blood flow and poor mobility, it indicates that the solid thyroid nodules have a malignant tendency. In this case, it is recommended that the patient undergoes further pathological examination, and the diagnosis is further clarified by ultrasound-guided puncture or direct surgical excision for pathological examination, and once the diagnosis is confirmed to be malignant, the patient needs to undergo the treatment of thyroid cancer. In conclusion, when patients have solid thyroid nodules, they should be clearly diagnosed and treated under the guidance of doctors.