Objective To explore the correlation between the serum thyroxin and depressive symptoms of patients with depression. Methods A total of 149 patients with unipolar depression( UD group),40 patients with bipolar depression( BD group) and 40 healthy people( control group) were selected and examined for the serum levels of TT3,TT4,TSH,FT3 and FT4. The patients in UD group were treated with antidepressants for 3 months and divided into the remission UD group and the unremission UD group according to the scores o...