Thyroid nodules that have gotten smaller after a puncture usually still need to be treated. After a thyroid nodule puncture, if it is determined to be benign and the nodule itself is relatively small, it can be reviewed regularly. If the nodule is found to be malignant after the puncture, radical surgery for thyroid cancer is needed as soon as possible. Some of the reasons why thyroid nodules become smaller are that the patient’s dietary habits are adjusted and the hyperplastic nodules become smaller. It may also be caused by degenerative changes in thyroid cysts or adenomas, where the fluid inside the cyst is absorbed and the nodule appears to shrink in size. Regardless of the cause of thyroid nodule shrinkage, patients should pay enough attention and continue to receive treatment to prevent the possibility of deterioration of the nodules. If there is any discomfort, consult a doctor promptly.