Thyroid hormones are crucial for metabolism, growth and development, energy expenditure, and the function of many organs.4 Radiation-induced thyroid complications, which include hypothyroidism, hyperthyroidism, Graves’ disease, benign adenoma, and even thyroid cancer, have been reported in the literature.5,6 Hypothyroidism is the most common complication of the radiation. The gene discussed is TG; the disease is thyroid gland disorder.