P t st is post dramatic stress disorder, which is when you have a dramatic event and it lingers. C p t s d is complex post dramatic distrstress disorder - repeated things that are dramatic. So we see this a lot in cases of parent, parental trama where it's like chronic,. Like you go home every day after school and your parents will yell at you, or they'll hit you... Or something worse. And so that affects some one's mind and creates an illness different from a single event.