The association between PTSD and inflammation were observed primarily in blood inflammatory molecules including a wide spectrum of cytokines, and c-reactive protein (CRP), etc. Over the past several years, several studies have shown that an individual with PTSD elicits an enhanced level of blood cytokines such as IL-1β, IL-6, TNFα, etc. [73,74,75,76,77]. This evidence concerns the gene TNF and post-traumatic stress disorder.