For hyperthyroidism, you should not use medications containing iodine. This is because iodine is one of the main raw materials for the synthesis of thyroid hormones. If iodine is consumed in excess, it will increase the synthesis of thyroid hormones from the source, causing the body to produce more thyroid hormones that are already in excess, making the symptoms of hyperthyroidism more difficult to control and in severe cases leading to a life-threatening hyperthyroid crisis. Iodine is very important for hyperthyroidism patients, so they are required to avoid foods containing iodine, including the use of non-iodized salt when stir-frying vegetables. Too much or too little iodine intake directly affects the cure of hyperthyroidism and its recurrence.