Grade II thyroid nodules are considered benign nodules, commonly known as simple nodular goiter or thyroid adenoma. The main symptom is a pre-cervical swelling, or in many patients, there are no symptoms, but are found during a health check-up. The pre-cervical swelling or mass may be painful, and on examination the lesion may have a smooth surface that moves well up and down with swallowing and may be mildly painful to the touch. Some patients may also have abnormal thyroid function, because thyroid nodules occur due to abnormal metabolism of thyroxine in the body, resulting in hyperplasia of thyroid follicles, and if gradually aggravated, the mass may also increase in size, and the patient may experience chest tightness and shortness of breath due to pressure on the trachea, or even a significant sense of pressure in severe cases, requiring surgery.