Whether a thyroid nodule that has increased in size by 2mm in three months requires treatment depends on the nature of the nodule, the presence or absence of significant symptoms, etc. Malignant nodules usually require treatment, while asymptomatic benign nodules usually do not require treatment. Thyroid nodules that have increased in size by 2mm in three months indicate that the nodules have progressed. Ultrasound can be used to examine other features of the nodules, such as cystic solidity, whether the edges are regular, and whether there are microcalcifications, etc. A puncture biopsy can be performed if necessary. If the diagnosis is benign and there are no obvious symptoms, it can be observed for the time being and does not require any special treatment. If the thyroid nodule is diagnosed as malignant or if the benign nodule is large enough to cause pressure symptoms, surgical removal is recommended. In the case of thyroid nodules that have increased in size by 2mm in three months, it is recommended that the patient go to the hospital and ask the doctor to make a judgment and formulate an individualized treatment plan.