1. Obey the discipline, follow the doctor’s arrangement and line up to take the medicine in the order of the medication list; 2. Do not eat any food within 2 hours after taking the medicine to ensure the complete absorption of 131 iodine; 3. Do not spit or spit anywhere within half an hour after taking the medicine to prevent the loss of the medicine; 4. Patients in the field should rest overnight after taking the medicine and leave only the next day to prevent them from getting seasick and spitting up the medicine; 5. Rest well for a period of time. Especially rural patients should not participate in heavy physical labor within one month after taking the medicine. A small number of patients 2-3 days after taking the drug dizziness, panic, dry mouth, neck swelling and skin itching and other symptoms, is the normal reaction after treatment, will disappear on its own in a week or so. Individuals with heavy symptoms can be treated symptomatically, but patients should not rub the thyroid gland; 6. After taking 131 iodine, prohibit the consumption of iodine-containing drugs, seafood and stimulating foods such as tobacco, alcohol, strong tea, coffee and pepper to avoid reducing the therapeutic effect. Individuals with severe disease can use anti-thyroid drugs for a short period of 2-3 days after taking 131 iodine to reduce symptoms; 7. Avoid strenuous activities and mental stimulation for one month after taking 131 iodine, and do not catch a cold, fever or diarrhea to avoid hyperthyroid crisis. If a patient has a cold, fever or diarrhea, she should immediately go to a local hospital for symptomatic treatment to prevent aggravation of her condition. 8. Married female patients should use contraception for at least six months after taking 131 iodine to reduce the possibility of recurrence of hyperthyroidism, after which pregnancy has no effect on health. 9.