After surgery, even though the patient was asymptomatic, thyroid function was evaluated: TSH: < 0.08 mU/L (RR: 0.45–4.0 mUI/L); fT4: 1.9 ng/dL (RR: 0.7–1.8); thyroglobulin (Tg): 54.5 ng/mL (RR: 1.4–78 ng/mL); positive thyroglobulin antibodies (TgAb) and TRAb: 2.28 UI/L (RR: <1.75 UI/L) indicating hyperthyroidism and the presence of an autoimmune disease. The gene discussed is TG; the disease is autoimmune disease.