Thyroid nodules are common in the population. The prevalence varies depending on the screening method and the population enrolled. Physical screening methods are simple, easy to perform, and inexpensive. However, the rate of nodule detection is influenced by the condition of the examinee. The prevalence rate in adults is 0.4% to 5.1%. In children, it is 0.2% to 1.4%. The average is 3-5%, increasing with age, from 2% at age 20 to 5% at age 70. The annual incidence is 0.09%, more women than men, with 0.11% for women and 0.06% for men. How to prevent it? 1.Prohibit the consumption of industrial salt and loose salt, and try to consume edible salt licensed by the state. 2. Avoid repeated radioactive examinations and irradiation of the neck as much as possible. 3.Check thyroid function and nature of nodules regularly every year for early detection and early treatment. 4.People who have a history of thyroid nodule surgery should also be reviewed regularly to avoid recurrence. 5, thyroid nodules taking thyroid hormone treatment, if the effect is not good, should strive for early surgery to prevent the emergence of cancer. Regardless of single nodule, multiple nodules, hot nodules, warm nodules or cold nodules in the thyroid gland, it is more positive and safe to take surgical treatment to prevent malignant nodules from being missed. This is because current tests are difficult to diagnose early. Ultrasound high frequency examination is non-invasive, sensitive and reproducible. The average prevalence of nodules is 30% to 40%, with 20,6% to 72% in women and 7,9% to 19,5% in men. Autopsy is the gold standard, with a nodule detection rate of 8.2% to 65%, with an average of 40% to 50%. If there is a history of radiation exposure to the head and neck at a young age, the average incidence of nodules is further increased. There is a wide variation in the data reported as to whether the nodules are more solitary than multiple, or more multiple than solitary. Among the thyroid nodules in our hospital. About 78 or 56% of the surgically confirmed single nodular goiters were benign nodules, while the remaining 21 or 44% were malignant nodules. According to related reports: about 12% of the thyroid adenomas were found in autopsies, and the incidence was more in women than in men, with the ratio of female to male incidence being 4:1 to 5:1.