Genetics, on-going overwhelming stress, and many risk factors  like preexisting mental illnesses or lack of emotional support, likely play a role in determining  who will experience PTSD.
Genetika, trenutni preplavljujući stres i mnogi rizični faktori, poput prijašnje mentalne bolesti ili manjak emocionalne podrške, vjerojatno igraju ulogu u  određivanju tko će iskusiti PTSP.