After the treatment of hyperthyroidism with iodine 131, in order to make your recovery better and avoid the aggravation of hyperthyroidism and other unfavorable factors, the following precautions should be summarized and strictly followed by patients and their families. 1. After the treatment of hyperthyroidism with iodine 131, pay attention to prohibit eating seafood for at least 1 month and prohibit iodine for 2 weeks. Do not rub and massage the thyroid area for one week. 2. These patients can eat foods rich in protein and vitamins (except seafood), such as meat, eggs, milk, fresh vegetables, etc. It is recommended to avoid or reduce the use of excitatory drinks such as coffee and alcohol for 1 month. It is recommended that patients with hyperthyroidism proptosis quit smoking or minimize smoking. 3. After iodine-131 treatment for hyperthyroidism, patients should pay attention to rest and recuperation, avoid fright, quarrels and mental stimulation, refrain from heavy physical work for 3 months, and refrain from strenuous activities for 6 months. 4. Fasting in the morning of the day of iodine-131 treatment, and if necessary, oral insulin before 7:00 a.m. The dosage should be in accordance with the doctor’s prescription. Do not eat until 2 hours after taking iodine-131 orally. Please follow the doctor’s prescription for other medications and continue symptomatic treatment. If you have any abnormalities in taking the medication, please feel free to contact me, either by leaving a message on the Internet, or by talking to me on the phone through telephone consultation, or coming to my clinic if necessary. 5. If you have cold or enteritis after Iodine-131 treatment, you should treat it in time to avoid aggravation of hyperthyroidism. If the hyperthyroidism is aggravated, you should contact me in time, either by telephone or directly. 6. Patients with severe hyperthyroidism must be hospitalized for comprehensive treatment. Iodine-131 treatment usually requires several days of observation. 7. Drink more water within 3 days after oral administration of iodine-131, do not have close contact with pregnant women and children for 1~2 weeks, and require contraception within 6 months. 8. Please note that long-distance patients with motion sickness treated in outpatient clinics should take a bus the next day after iodine-131 treatment to avoid vomiting and contamination, which may affect the efficacy of treatment. 9. Patients with hyperthyroidism treated with iodine-131 please note that please do not come to the nuclear medicine department within 1 month after treatment to prevent interference with the detection of other patients, unless the condition is special, come to me for telephone consultation and contact in advance. 10. Review 2, 4 and 6 months after treatment to regulate and evaluate the efficacy of treatment. Seafood and iodine are still strictly forbidden for 2 weeks before the review. Please come to the nuclear medicine thyroid clinic on an empty stomach from Monday to Thursday at 8am. If it is not convenient to come to the clinic, you can consult with me by phone and have the examination at the local hospital.