1. General: Take rest for 2-3 weeks after taking 131 iodine, avoid overexertion and mental stimulation, and prevent colds. 2. Diet: Eat 2 hours after taking 131 iodine, drink more water within 2 days, forbid food containing iodine for 1-3 months, and strengthen nutrition. 3.Protection: Reduce contact with pregnant women and children within 1-2 weeks. 4.Fertility: Within six months, women should not be pregnant and men should use contraception. 5.Medication: comply with doctor’s orders. 6, neck: 1 week do not knead the thyroid gland. 7, eye protection: do not smoke, you can wear tinted glasses, use eye care drops, ointment. 8, review: recheck FT3/FT4/STSH at 1 month, 3 months and 6 months after treatment, and then need to recheck 1-2 times a year. 9, changes in the condition at any time to see a doctor, timely treatment of hypothyroidism, the above time can be adjusted according to individual conditions.