Before and after iodine-131 treatment: 1. One month before iodine-131 treatment, you need to stop consuming iodine-containing drugs and food, and do not do enhanced CT within one month before treatment. female patients of childbearing age, please pay attention to exclude the possibility of pregnancy, and pregnant women and nursing mothers are prohibited from doing nuclear treatment. 2. Before taking the medicine, please put the water cup into the cup holder at the outlet of the medicine. When the medicine enters the water cup completely and you hear the instruction to take the medicine, start to take the medicine and put the water cup into the lead canister after taking the medicine. 3. Take iodine-131 on the day of iodine-131 treatment after two hours of fasting. It is better to wait for 2 hours after taking the drug before eating (so that the drug is absorbed more fully). During this period of time, you can drink moderate amount of water, take Vc and acidic sugar tablets, fruits, etc. to reduce salivary gland inflammation. Patients with DTC should take iodine for 2 days and then take thyroxine tablets as a replacement therapy, the dosage should be according to the doctor’s prescription. 4. stay in the lead-shielded detention room for 48 hours after taking the drug, the doctor is on duty 24 hours a day, call the duty phone and indoor intercom video contact when necessary. come to the nuclear medicine department for iodine-131 whole body scan seven days after DTC patient’s treatment. 5. Within one week after iodine-131 treatment, pay attention to rest and recuperation, and drink more water appropriately. Avoid sharing utensils with others. 6. Avoid unnecessary close and prolonged contact with others within 1 week after treatment (close means within 1 meter, prolonged means more than 3 hours). For children under three years old and pregnant women, it is appropriate to avoid close and prolonged contact for a longer period of time. 7, the family living conditions are better to use an independent bathroom, independent bedroom for a week. Those who share the bathroom should pay attention to avoid urine splashing, prevent sanitary ware and ground contamination, flush clean in time after defecation, and do not share the bed with others within a week of taking the medicine. 8. Within one month after treatment, take care not to consume foods with high iodine content (such as kelp and nori) and avoid the use of iodine-containing drugs (such as X-CT contrast agent). 9.Pay attention to proper rest, avoid strain and mental stimulation, and pay attention to the prevention of infection. 10.There will be swelling or discomfort in the neck for 1~2 weeks after treatment, so pay attention not to touch or even press the neck to avoid aggravating the condition. 11.If there is heavy sweating or fever, body temperature >38°C; nausea, vomiting, diarrhea, irritability; heart rate >140 beats/min. This may indicate the possibility of hyperthyroidism, if any of the above conditions should immediately seek medical attention. 12. Men and women of childbearing age should pay attention to contraceptive measures. Female patients should not become pregnant until at least one year after receiving Iodine-131; male patients should use contraception for at least six months after receiving Iodine-131. For special cases, please consult your treating physician.