In Israel and Palestine the majority of the population are under fifteen and so have never known peace. It's not surprising then that many have symptoms of post-traumatic stress disorders.
They may suffer from severe depression and feelings of hopelessness, or disturbing flash-backs. Children can recover from the trauma, but many researchers say that the size and scale of the problem means the international community must step in.
Panos Vostanis is a child psychiatrist. He visited the Gaza Strip where over a third of the children now have mental health problems. Helene Sharp interviewed him about his research there.