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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.
For others, the symptoms may not begin or may not become a problem until years later. Symptoms of PTSD may include: 1  Repeatedly thinking about the trauma. 2  You may find that thoughts about the trauma come to mind even when you donât want them to. 3  You might also have nightmares or flashbacks about the trauma or may become upset when something reminds you of the event. 4  Being constantly alert or on guard.