Iodine is the main raw material for synthesizing thyroid hormones. Iodized salt will increase the synthesis of thyroid hormones and worsen the symptoms of hyperthyroidism, so patients should try to choose non-iodized salt. Precautions for hyperthyroidism patients are as follows: 1. Do not eat other foods containing iodine, such as seafood like kelp and seaweed; 2. Do not take drugs containing iodine, such as amiodarone; 3. Avoid straining and staying up late at night, and avoid eating spicy and stimulating foods, such as chili peppers and drinking strong tea and coffee.