Post-Traumatic Stress Disorder (PTSD) is an anxiety disorder caused by a major physical or emotional trauma. It commonly affects traumatic accident victims.
According to the Oxford Medical Dictionary, the onset PTSD occurs at least one month after the traumatic experience. PTSD victims report flashbacks, nightmares, and anxiety. PTSD victims also engage in avoidance behaviors. For example, motor vehicle accident victims often develop PTSD in the form of driving anxiety. Occasionally, the anxiety is so severe that these individuals avoid all forms of motor vehicle transportation.