Absolutely, severe PTSD symptoms in veterans often coincide with heightened inflammation through a specific mechanism linking PTSD to pro-inflammatory cytokines like interleukin-1 beta (IL-1β), interleukin-6 (IL-6), interleukin-10 (IL-10), and tumor necrosis factor-alpha (TNF-alpha). This evidence concerns the gene IL1B and post-traumatic stress disorder.