Post-traumatic stress disorder (PTSD) is a mental health condition that may develop after a terrifying ordeal, typically involving physical harm or the threat of physical harm. Symptoms of PTSD may appear as early as three months after the traumatic event, but usually appear after one year. PTSD symptoms are grouped into four types: intrusive memories, avoidance, negative changes in thinking and mood, and changes in emotional reactions. Some specific examples of PTSD symptoms are flashbacks, emotional numbness, irritability, trouble sleeping, and difficulty maintaining close relationships. PTSD symptoms can vary, especially with time. PTSD symptoms may be felt during periods of stress or when other experiences are a reminder of the traumatic event. Symptoms must carry on for more than a month to be considered PTSD. A psychiatrist or psychologist can diagnose PTSD after discussing symptoms and specific concerning thoughts with the patient. To be diagnosed the person must have all of the following symptoms for a least one-month: re-experiencing symptom, avoidances symptoms, and extreme mood changes. PTSD may also be coupled with other mental conditions such as depression, substance abuse or other anxiety disorders. The primary treatment for PTSD is psychotherapy, but often medication is also used. Psychotherapy usually includes exposure therapy and cognitive therapy, which helps you recognize the ways of thinking. Medications used to treat PTSD include antidepressants, anti-anxiety medications and other medications to address insomnia and nightmares.