Patient: Description of condition (onset, main symptoms, hospital visited, etc.): Male, 22 years old, treated with Iodine 131 on February 13, 2011, retested for hypothyroidism in May, took one tablet of Eugenol, retested two months later FT3: 2.39 reference value (1.45-3.48) FT4: 1.00 reference value (0.71-1.85) TSH: 6.52 reference value ( (0.49-4.67) On February 13, 2011, Iodine 131 treatment was administered. Wang Ping, Department of General Surgery, The Second Affiliated Hospital of Zhejiang University School of Medicine: Permanent hypothyroidism is a sure thing! This is a sign that I131 treatment is effective, and the incidence of hypothyroidism increases significantly over time. You should take eugenol treatment now, the amount is not enough, ask the endocrinologist for treatment. Check your thyroid ultrasound annually and pay attention if thyroid nodules appear.