It is best to eat non-iodized salt for hyperthyroidism. Hyperthyroidism is thyrotoxicosis caused by excessive secretion of thyroid hormones by the thyroid gland itself, resulting in accelerated metabolic activity of the body, increased excitability of the nervous, circulatory, digestive and other systems and hypermetabolic clinical syndrome, mainly manifested by fear of heat, excessive sweating, irritability, diarrhea, weight loss and other symptoms. Hyperthyroidism patients have high levels of thyroid hormones, and iodine is the raw material for synthesizing thyroid hormones. If iodine is ingested again, the hyperfunctional thyroid gland will synthesize more thyroid hormones, which will aggravate the condition. Patients with hyperthyroidism should not only eat non-iodized salt, but also avoid eating iodine-rich foods such as kelp, nori, sea fish and sea shrimp. Patients with hyperthyroidism should go to the hospital and be treated under the guidance of a doctor.