There are many reasons for the formation of small nodules, including excessive cell proliferation, or the diet, such as excessive or insufficient iodine intake, which can lead to the development of nodules in the thyroid gland, such as nodular goiter. Sometimes the balance between oncogenes and oncogenes in the body is disrupted, resulting in the growth of tumor cells, which can also manifest as small nodules, which are malignant nodules and malignant tumors. In clinical practice, we cannot judge the benignity or malignancy of a nodule based on its size. Once there is a nodule on the body, it is necessary to go to the hospital for examination, and ultrasound examination can be used to determine the benignity or malignancy of the nodule. In some cases, a small amount of tissue can be extracted by puncture with a fine needle for pathological examination to determine the benignity or malignancy of the nodule.