Local Veterans upset over Kilpatrick's Post Traumatic Stress Disorder diagnosis

What part of Post Traumatic Stress Disorder is not being understood here? PTSD only comes from a traumatic event.

Local Veterans upset over Kilpatrick's Post Traumatic Stress Disorder diagnosis
Many people were outraged when Kwame Kilpatrick's doctor says that the ex-mayor suffers from post- traumatic stress disorder.
click link to read more