There is no exact range of how many mm or more thyroid nodules are recommended for surgery. Generally, surgery is recommended for thyroid nodules larger than 40 mm or more. This is mainly for malignant nodules, for benign nodules need to be analyzed according to clinical symptoms. Thyroid nodules are mainly categorized into benign and malignant nodules. For benign thyroid nodules, asymptomatic benign nodules usually do not require treatment and should be observed first. If the size of the nodule gradually becomes larger and the patient is accompanied by symptoms such as dysphagia, dyspnea, and esophageal compression, surgery is generally recommended. For malignant thyroid nodules, no matter how big they are, they usually need to be surgically removed so that they do not develop into advanced thyroid cancer, which will affect your health. Most malignant nodules can be cured in the early stages, and patients are advised to have early detection and early treatment. If you find thyroid nodules, you should go to the hospital in time, and under the guidance of the doctor to actively carry out treatment to avoid adverse effects.