Thyroid nodules of 2 centimeters may be important, the specific degree of importance also need to be combined with medical history, ultrasonography, needle aspiration cytology. 1. Medical history: Most patients usually have no obvious symptoms. If thyroid nodules existed in the past and have suddenly and rapidly enlarged painlessly recently, they should be consulted promptly. 2. Ultrasonography: Currently, it is the preferred examination method for evaluating thyroid nodules, which can make a preliminary assessment of the size, number, shape and blood supply of thyroid nodules, as well as make a classification of the nodules. 3. Needle aspiration cytology: At present, ultrasound-guided needle aspiration cytology has been widely used to determine the appropriate treatment according to the benign or malignant results. If patients find thyroid nodules, they must consult the doctor in time and carry out standardized diagnosis and treatment under the guidance of the doctor to avoid delaying the condition.