The symptoms of Post-Traumatic Stress Disorder can manifest in certain changes in the person who suffers it.
The person could be irritable, hypervigilant, have fits of anger, unexpected reactions to things around them, could have self-destructive behaviors. There could be isolation. He would not relate well with his family and less with friends. They may have sudden memories of what happened, which will be involuntary and that will seem to that person as if they were happening again. Have anxiety, depression, be distrustful and be afraid. Obviously the sleep will be affected; there will be nightmares, night terrors, insomnia. The fear of reliving what happened while sleeping makes the person prefer not to go to sleep. All this becomes a great depression, which takes away from the individual the desire to do what he used to love, produces isolation, always makes him feel negative and very sad, without hope, and even if he has his family by his side with a great feeling of loneliness.
Of course these symptoms can vary with each person and be more or less intense, without having a specific duration; they can be exacerbated if there are moments of stress or in front of things or moments that remember the traumatic event experience
Source: Mónica Torres