People exposed to a traumatic incident will most likely develop some of the symptoms of PTSD. These symptoms can be very long lasting and severe. Why PTSD develops is currently being studied. Biological, psychological and social factors affect the development of PTSD. PTSD is not diagnosed unless the symptoms last for 1 month or longer. | People exposed to a traumatic incident will most likely develop some of the symptoms of PTSD. These symptoms can be very long lasting and severe. Why PTSD develops is currently being studied. Biological, psychological and social factors affect the development of PTSD. PTSD is not diagnosed unless the symptoms last for 1 month or longer. |