In order to make hyperthyroidism patients get satisfactory results and smooth treatment, and to avoid factors that interfere with the treatment of hyperthyroidism with iodine 131, we would like to summarize the precautions before iodine 131 treatment for hyperthyroidism, and hope that patients and their families will understand and follow them. 1. Stop eating seafood, such as kelp, sea fish, shrimp, nori, etc., generally for more than 1 week. 2. Prohibit the use of iodine disinfectant and iodine-containing drugs, such as Huasu tablets, etc. If you are already using hyperthyroidism, please inform your treating physician of the specific situation. 3. Take rest and avoid colds and gastroenteritis, and inform your physician if you have any condition in order to treat the symptoms. 4. Use leukostatic drugs, heart rate lowering drugs and sedative drugs if necessary, as prescribed by your physician. 5. In general, patients with severe hyperthyroidism cannot choose iodine 131 treatment directly, but must be given pretreatment after diagnosis by a specialist, and then arrange iodine 131 treatment at a later date, which is safer. If necessary, patients should be hospitalized for comprehensive treatment. 6. Patients taking antithyroid drugs such as Tabazol (methimazole tablets) or Sage will be arranged for treatment by a specialist. 7. Patients who are hospitalized in our hospital must be arranged for treatment after consultation. If you want to see me, you can consult with me by phone in advance to be prepared. 8. Patients who are breastfeeding, pregnant or have postponed menstruation should inform your doctor and attending physician for screening and treatment planning. 9. After the above preparation, if you basically meet the conditions of preparation before iodine 131 treatment, you should undergo the following tests after coming to the hospital: blood routine, complete set of nail function, iodine absorption rate, chest X-ray, electrocardiogram, thyroid imaging, liver and kidney function or other special tests. 10. Please contact me in time when you have questions in the treatment. Patients from abroad can leave messages with me online, because the hospital is busy, in order to guarantee relatively fast response, so there is a certain limit on the number of online consultation questions per day, please understand. In the event of a clinic closure, the response to the online consultation will be affected. If you wish to communicate with me as soon as possible, you can apply for telephone consultation service, and I will try to talk to you on the same day.