Patients with PTSD exhibit an imbalance between pro- and anti-inflammatory cytokines, characterized by elevated peripheral levels of interleukin-1β (IL-1β), interleukin-6 (IL-6), interferon-gamma (IFN-γ), tumor necrosis factor-alpha (TNF-α), and C-reactive protein (CRP). This evidence concerns the gene IL6 and post-traumatic stress disorder.