The use of iodized salt to prevent iodine deficiency disorders is very safe and effective. Since the first introduction of salt iodization in the world about 90 years ago, there have been no incidents of iodine overdose, iodine poisoning or iodine allergy caused by the consumption of iodized salt. In recent years, some clinicians have reported an increase in the number of patients suffering from hyperthyroidism (hyperthyroidism for short). With the development of social economy, people’s living standard has generally improved, their dietary structure has changed, and their awareness of health care has increased. In the future, more patients will be identified as hospital visitation rates, surgery rates, and the ability to detect disease early continue to improve. This increased prevalence of the disease is not a statistical information after strict epidemiological sampling, but only a perception, which is biased. Hyperthyroidism is a clinical syndrome caused by excessive secretion of thyroid hormones due to multiple etiologies. The causes of hyperthyroidism are currently thought to be related to genetic factors, autoimmune and psychiatric factors. The accelerated pace of life, high work pressure, rising divorce rate and mental anxiety due to unemployment are also among the main factors triggering hyperthyroidism. There is no need to worry about the consumption of iodized salt by normal people, as it is not harmful to human health.