Post-traumatic stress disorder is a sustained effect after suffering extreme catastrophic. After experiencing trauma, people have continuous, unnecessary, uncontrollable thoughts about unrelated events, a strong desire to avoid mentioning events, sleep disorders,  withdrawal from society and intense alertness anxiety disorder.
order?
Xiao Zhang used to be trapped in the elevator for more than five hours. At that time, he felt that he was hopeless. In the end, he finally turned away from danger. But since then, Xiao Zhang often dreams of being trapped in the elevator, and he never dared to take the elevator anymore.