The aim of our study was to investigate weather hormones (cortisol and prolactin), proinflammatory cytokines (interleukin-6 (IL-6) and tumor necrosis factor-alpha (TNF-α)), lymphocyte expression of glucocorticoid receptor (GR), immune function (NKCC, natural killer cell cytotoxicity) and peripheral blood percentages of various lymphocyte subpopulations (T cells, helper T cells, cytotoxic T cells, B cells, natural killer (NK) cells, memory T cells and memory helper T cells) change in patients with PTSD over time.