What will happen if the thyroid is not operated on is analyzed based on the different conditions of the patient. First, if the thyroid is smaller cystic lesions and nodules, there is no obvious blood flow signal around the lesion, suggesting that the nodule will not have a large change in a short period of time, this situation can indeed not need surgical treatment, close observation of the size of the lesion can be, will not have a serious impact on the human body. Second, if the thyroid lesion is accompanied by calcification, blood flow signal, unclear boundary, aspect ratio is greater than one, highly consider malignant tumor, the patient does not have timely surgical resection, there is a possibility that the tumor cells along with the lymphatic vessels and blood vessels, resulting in cancerous invasion of peripheral lymph nodes, the lesion volume further increase, there is a possibility of distant metastasis, which will endanger the patient’s life. Third, if there is a huge mass in thyroid gland without surgical treatment, the mass will compress the trachea and esophagus of human body, which will seriously affect normal breathing and eating, and will affect the life of patients.