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PTSD is marked by clear biological changes as well as psychological symptoms. PTSD is complicated by the fact that people with PTSD often may develop additional disorders such as depression, substance abuse, problems of memory and cognition, and other problems of physical and mental health.
Three different types of post-traumatic stress disorder exist. If symptoms last less than three months, the condition is considered acute PTSD. If symptoms last at least three months, the disorder is referred to as chronic PTSD. If symptoms manifest at least six months following a traumatic event, the disorder is classified delayed-onset PTSD, according to the National Institute of Health (NIH).