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Low blood levels of the thyroid hormones — triiodothyronine (T3) and thyroxine (T4) — signal the hypothalamus to release the thyrotropin-releasing hormone (TRH). TRH then reaches the pituitary gland and stimulates the release of thyroid-stimulating hormone(TSH) into the bloodstream.
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The Cross-sectional and Longitudinal Association Between Thyroid Function and Depression: A Population-Based Study.

Oscar Hernando Roa Dueñas1, Amy Hofman1, Annemarie I Luik1,2

  • 1Department of Epidemiology, Erasmus University Medical Center, 3000 CA Rotterdam, The Netherlands.

The Journal of Clinical Endocrinology and Metabolism
|October 19, 2023
PubMed
Summary
This summary is machine-generated.

Thyroid function is linked to depression risk. Lower thyrotropin (TSH) and varied free thyroxine (FT4) levels showed cross-sectional links to depressive symptoms, with a U-shaped FT4 association longitudinally in euthyroid individuals.

Keywords:
FT4TSHcross-sectionaldepressionprospectivethyroid disease

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Area of Science:

  • Endocrinology
  • Psychiatry
  • Epidemiology

Background:

  • Thyroid dysfunction is often linked to mood disorders.
  • Longitudinal studies investigating this thyroid-depression link are scarce.

Purpose of the Study:

  • To examine the cross-sectional and longitudinal associations between thyroid function and depression.
  • To investigate thyroid function markers including thyrotropin (TSH), free thyroxine (FT4), and thyroid peroxidase antibodies in relation to depressive symptoms and events.

Main Methods:

  • Cross-sectional analysis of 9471 individuals and longitudinal analysis of 8366 individuals.
  • Assessment of thyroid function via serum samples and depressive symptoms using the CES-D scale.
  • Longitudinal follow-up for incident depressive events using the CES-D scale and clinical interviews.

Main Results:

  • Cross-sectionally, lower TSH and varied FT4 levels were associated with increased depressive symptoms.
  • Hypothyroidism correlated with fewer depressive symptoms, while hyperthyroidism correlated with more.
  • Longitudinally, a U-shaped association between FT4 and depressive events was observed in euthyroid participants.

Conclusions:

  • Thyroid dysfunction shows a cross-sectional association with depressive symptoms.
  • A U-shaped relationship between FT4 and incident depressive events exists in euthyroid individuals.
  • Thyroid function may influence depression risk, though the association is small and potentially influenced by reverse causation or other factors.