Efficacy of Transcranial Direct Current Stimulation (tDCS) for the Treatment of Major Depressive Disorder

The aim of this study is to assess the efficacy of Transcranial Direct Current Stimulation (tDCS) as an Add-on Treatment for the drug-naïve Major depressive disorder. Meanwhile, evaluate the effect of tDCS on cognitive function of drug-naïve MDD patients. Furthermore, the investigators will examine the changes in cortisol, gut microbiome and some biomarkers. The hypothesis of this study is that tDCS alleviate the depressive symptoms and improve the cognitive function of drug-naïve Major depressive disorder patients with regulating inflammatory response.