Health Behavior of Adolescents in Negative Life Events, Social Support, and Protective and Risk Behavior. The examination of the health-behaviour of adolescents is in the focus of the scientific research for long years. This is important, because over the world–also in Hungary–it goes on the continous and uninterruptedly growing decay of healthbehaviour of teen-ages for long. Smoking, alcohol-and drugconsumption, the inadequate sexual attitudes are more and more spreading among teenagers. Moreover these risks of health-behaviour appears more and more in younger ages. It could be placed many factors between reasons, such as defects of socialization scenes, negative life-experiences and the social effects, that are especially important in adolescence. We also have to mention the negative cultural effects of the postmodern era, for example diminish of classic, essential human and social values, and the shallowness of friendly and parental connections. In this paper I study health-behaviour of teen-age youth with different socioeconomic background, analyzed with half-structural interviews. In line with this the paper I enter into details of negative life events of youth, and also discuss the connections and impress on each other of these.