The cause of elevated urinary iodine should be determined first, and then targeted treatment should be done, including thyroid function tests and thyroid ultrasound. If there is no hyperthyroidism or goiter, it is usually related to excessive iodine intake, and can recover on its own by not eating iodized salt, seaweed, nori and other iodine-rich foods. If there is hyperthyroidism, you should consider methimazole or propylthiouracil in addition to limiting the intake of iodized salt. A significantly enlarged thyroid gland on thyroid ultrasound may be related to thyroiditis, which can be treated with glucocorticoids such as prednisone or nonsteroidal anti-inflammatory drugs such as indomethacin while limiting iodine intake. For infectious thyroiditis, add symptomatic treatment with antiviral drugs such as virazole or antibiotics.