OBJECTIVE: Various somatic antidepressant treatments of depression are
associated with substantial but limited decreases in T4 levels. This study
examined changes in patients' thyroid hormone levels during a period of
cognitive behavior therapy. METHOD: Thyroid hormone levels of 30 patients
with major depressive disorder were measured before and after they received
20 weekly sessions of cognitive behavior therapy. RESULTS: There were
significant decreases in measures of T4 in the 17 responders to cognitive
behavior therapy and increases in the 13 nonresponders. CONCLUSIONS:
Cognitive behavior therapy has an effect on the thyroid axis similar to
that of somatic antidepressant treatments.
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