Global epidemiology of hyperthyroidism and hypothyroidism

Area of Science:

• Endocrinology
• Epidemiology
• Public Health

Background:

• Thyroid hormones are crucial for growth, development, reproduction, and metabolism.
• Hypothyroidism and hyperthyroidism are widespread conditions with severe health implications.
• Iodine nutrition significantly impacts thyroid disease risk, alongside factors like age, genetics, and environmental exposures.

Purpose of the Study:

• To review the global incidence and prevalence of hyperthyroidism and hypothyroidism.
• To highlight geographical variations in thyroid dysfunction.
• To examine the influence of environmental factors, particularly iodine intake, on thyroid disease epidemiology.

Main Methods:

• Review of global epidemiological data on thyroid dysfunction.
• Analysis of geographical differences in disease prevalence.
• Assessment of environmental factors, including iodine status and supplementation, and their impact.

Main Results:

• Prevalence of undiagnosed thyroid disease may be decreasing in developed nations due to increased testing and treatment.
• Iodine deficiency remains a concern in developed countries, especially in Europe.
• Significant gaps exist in epidemiological data for thyroid dysfunction in developing countries.

Conclusions:

• Continued monitoring for iodine deficiency is necessary globally.
• There is an urgent need for comprehensive epidemiological surveys of thyroid dysfunction and iodine status in developing nations.
• Understanding diverse risk factors is key to managing thyroid disease globally.