Thyroid cysts are generally benign lesions, so their malignancy rate is not high, and they generally do not become malignant. Thyroid cysts can be solitary or multiple, and usually grow slowly without any clinical symptoms. Routine monitoring is mainly based on color Doppler ultrasound to observe changes in the cysts. If the cyst shows calcification of the cyst wall or rapid growth, attention should be given to whether there are other changes or internal bleeding within the cyst. Timely surgical treatment can lead to a very good prognosis.