Evidence check: TSH in the context of stress

The hypothalamic-pituitary-thyroid (HPT) axis and the hypothalamic-pituitary-adrenal (HPA) stress axis interact. Acute stress can transiently suppress TSH, while chronic stress via cortisol may reduce T4-to-T3 conversion and blunt TSH secretion. The evidence is moderate: human studies (e.g., exam stress, shift work) show associations, but no large RCTs confirm causality. Many confounders (sleep, diet, inflammation) overlap. A single TSH value under stress is insufficient to diagnose or rule out thyroid dysfunction. Clinical guidelines recommend repeat testing under standardized conditions (morning, fasting, rested). The provided context contains no specific data on TSH and stress; this answer is based on general medical evidence.