PTSD is most likely to follow interpersonal trauma such as violent assault but can also develop in the context of a natural disaster as well as severe accidents, house fires and witnessing something traumatic. Symptoms include:
flashbacks to the event so vivid that it’s like re-living it
physical and emotional hyper-arousal
hypervigilance
irritability and angry outbursts
exagerated startle response
insomnia
nightmares
difficulty concentrating.