Answer: Post-traumatic stress disorder.
Explanation:
It is an event that occurs in people who have witnessed or directly experienced a stressful event from the past. When a person finds himself in a dangerous situation, it is natural for him to feel fear. This fear triggers many extremely rapid changes in the body that prepare the person to defend themselves or avoid them. However, with this disorder, this reaction is reversed. People with this disorder feel fear even when they are not in a dangerous situation.