Hyperthyroidism and clinical depression: a systematic review and meta-analysis.

Area of Science:

• Endocrinology and Psychiatry
• Epidemiology
• Medical Research

Background:

• Hyperthyroidism and clinical depression are prevalent conditions with suspected comorbidity.
• Previous estimates of this association in the general population lack meta-analytic rigor.

Approach:

• Systematic review and meta-analysis of Medline, PsycINFO, and Embase databases (up to May 2020).
• Inclusion of 15 epidemiological studies (239,608 subjects) with validated diagnoses of hyperthyroidism and depression.
• Random-effects meta-analysis using DerSimonian-Laird method to calculate odds ratios (OR).

Key Points:

• Patients with hyperthyroidism showed a 1.67 times higher odds of clinical depression compared to euthyroid individuals (95% CI: 1.49–1.87).
• The association was robust across sensitivity and subgroup analyses.
• Overt hyperthyroidism presented a slightly stronger association (OR 1.70) than subclinical hyperthyroidism (OR 1.36).

Conclusions:

• A significant positive association exists between hyperthyroidism and clinical depression.
• This comorbidity warrants clinical attention and investigation into potential neurobiological, genetic, or general somatic disorder risk factors.