Thyroid nodules are abnormal growths of thyroid tissue forming a mass. Thyroid nodules have no obvious manifestations in the early stages, and the symptoms are not obvious to individual patients, many of whom find them through physical examinations. The common stimulus for the appearance of thyroid nodules is still abnormal iodine intake. Long-term high iodine stimulation or iodine deficiency can stimulate the thyroid tissue to form abnormal follicular hyperplasia, resulting in thyroid nodules. Common nodular lesions include: thyroid cysts, nodular goiter, inflammatory nodules, and malignant nodules. Thyroid nodules are mostly asymptomatic in the early stage. With the gradual enlargement of the nodules and some other physical symptoms, patients may find a neck mass. Ultrasound examination can detect and understand the general condition of the nodules, including cystic nodules, cystic solid nodules, and solid nodules. Depending on the nature of the nodules, doctors will have different recommendations to do late follow-up, medication, surgery, and other options. In conclusion, thyroid nodules are common, and for your own protection, it is advisable to have regular annual checkups to detect smaller, more insidious lesions that can be intervened early.