Thyroid 4a, usually graded by thyroid ultrasound for thyroid nodules, may be benign or malignant nodules. If the nodule is benign, if there is no obvious symptom and no change in thyroid function, it can be reviewed regularly; malignant nodule can choose to do total thyroidectomy, partial thyroidectomy and lumpectomy thyroid surgery. 1. Benign thyroid nodules: For benign thyroid nodules, if there is no change in thyroid function and no obvious symptoms, regular checkups are possible. 2. Malignant thyroid nodules: malignant nodules can be treated with total thyroidectomy under the guidance of the doctor. Regarding thyroid 4a, the nature of the nodule should be analyzed before adopting the best surgical method, which should be carried out under the guidance of professional physicians.