Thyroid nodules are classified by ultrasound and are divided into five categories: nodules in categories 1 and 2 are benign nodules; nodules in category 3 have a tendency to become malignant, so regular follow-up is required, and generally speaking, an annual review of the thyroid ultrasound is sufficient. If the thyroid function is normal, the thyroid nodules should be monitored by the thyroid surgery department once a year. If thyroid nodules grow faster or even have a tendency to become malignant, i.e., thyroid nodules have changed from category 3 to category 4, it is important to shorten the follow-up period in a timely manner, basically once every 3-6 months. Patients with thyroid nodules need to pay attention not to eat foods that are particularly high in iodine, especially short-term intake of large amounts of kelp, seaweed, sea fish and other such things, too much intake, too fast, too concentrated, it is easy to appear thyroid nodule hyperplasia, pay attention to the situation can be. As for the need for surgical treatment, generally speaking, as long as the nodules do not show obvious symptoms of pressure, it is basically possible to observe them regularly.