The video for this presentation is available on our Youtube channel: https://youtube.com/allceuseducation A continuing education course for this presentation can be found at https://www.allceus.com/member/cart/index/index?c= From a survival perspective the symptoms of PTSD make a lot of sense. We explore not only how the cognitive symptoms can be understood in terms of helping people make sense of the situation and survive, but also how physical symptoms including hypocortisolism make sense to help the organism survive.