Effect of Seasonal Changes on the Transition Between Subclinical Hypothyroid and Euthyroid Status
This 2013 retrospective longitudinal study analyzed 1,751 individuals with subclinical hypothyroidism and 28,096 euthyroid subjects over a median follow-up of 36 months to assess the impact of seasonal variations on thyroid function. Findings revealed a biphasic pattern in TSH levels, increasing during winter-spring and decreasing in summer-fall. Notably, 57.9% of