The danger of thyroid nodules depends on the cause of thyroid nodules, which is usually related to thyroiditis, thyroid cysts, thyroid cancer and other diseases, and the degree of danger varies with different causes, as follows. 1. Thyroiditis: thyroid nodules are caused when thyroiditis develops a toxic stage of the thyroid gland. In the case of subacute thyroiditis, it is a self-limiting disease, and the treatment is only to relieve the symptoms, with a better prognosis; however, in the case of Hashimoto’s thyroiditis, hypothyroidism often occurs, and life-long thyroxine preparations are required for treatment. 2. Thyroid cysts: they are cystic lesions. Smaller cysts are usually not serious and do not require special treatment; larger cysts may cause compressive reactions or risk of rupture or bleeding, and require prompt treatment. 3. Thyroid cancer: it is a malignant tumor of the thyroid gland and its condition is more serious. Early and timely radical surgery can prolong the survival time. If the treatment is late, the prognosis is relatively poor, which will easily affect the survival rate. If you have found thyroid nodules, it is recommended that you consult a doctor in time.