To determine the prevalence of thyroid toxicity (thyrotoxicosis) in the population of Mongolia.

The survey was conducted using descriptive research methods. In order to study the prevalence of thyroid disease diagnosed nationwide, the actual number of thyroid diseases registered in 9 districts of the capital city and 330 soums of 21 aimags in 2011–2020 was collected. Thyroid disease in 330 soums and 9 districts was calculated for each aimag, soum, age group, and sex per 10,000 local population in a given year. The prevalence of thyroid disease was mapped using Arc view and GIS software.

Thyrotoxicosis is the most common thyroid disorder in Mongolia, accounting for 56.2%, with an average of 17.2 per 10,000 population in 2011–2020. In 2011, it increased 8.1 per 10,000 population, and in 2020, it increased 3 times to 25.1, and in the first 5 years, it increased 12.4 times per 10,000 population on average, and in the last 5 years it increased 21.8 times to 21.9. Thyrotoxicosis is the most common thyroid disorder in Mongolia, accounting for 56.2%, with an average of 17.2 per 10,000 population in 2011-2020. In 2011, it increased 8.1 per 10,000 population, and in 2020, it increased 3 times to 25.1, and in the first 5 years, it increased 12.4 times per 10,000 population on average, and in the last 5 years it increased 21.8 times to 21.9. In order to determine the motility of thyrotoxicosis, the disease was classified into three categories: less than 5 per 10,000 population, 5.1-10, and more than 10.1. In the last 10 years (2011–2020), less than 5 cases per 10,000 population accounted for 57% of all provinces, 20.1% for 5.1–10, and 22.1% for more than 10.1.

Among thyroid disorders, thyrotoxicosis accounts for 56.2%, iodine-deficient thyroid disease for 5.5%, and other thyroid diseases for 38.3%. Compared to 5 and 5 years, in the last 5 years, more than 20.1 cases per 10,000 population have increased by 12.7% compared to the first 5 years.