It is possible that the nodule is growing close to the arteries and veins of the thyroid gland, so there are enough small blood vessels to nourish the nodule’s growth. It is also possible that the nodule may have a localized break in the thyroid caused by trauma, or that a cyst-like nodule with internal bleeding may have a rapid short-term increase in size and a significant blood flow signal. In malignant thyroid nodules, the ultrasound findings are related to the number and location of the nodules, the poorly defined borders with the surrounding tissue, the abnormal size and shape of the nodules, and, of course, the presence of abundant blood flow. In addition, serological tests, based on thyroglobulin levels and calcitonin levels, can be performed to assist in the diagnosis. If it is benign, it is recommended to review it every three months and then provide targeted treatment. If it is malignant, it should be treated with early surgery and peripheral lymph node dissection.