The study was conducted by examining the relationship between Eysenck´s personality traits and mood, somatic symptoms and adolescent social relations, seeking to examine the predictive power of personality traits to predict these variables. The study was conducted at two time points, on the students from fifth to eight grade of the 4. Rijeka primary school. At the first time point, 265 students participated, while the second time piont, 3 years later, 173 students participated. Eysenck's Personality Questionnaire for Children was applied at the first time point, while 3 years later Mood Scale, Pennebaker Inventory of Limbic Languidness and Social Relations Questionnaire were applied. It is assumed that Eysenck´s personality traits will be associated with the adolescent moods, somatic symptoms and social relations, and that traits will be significant predictors of these outcome variables. All hypotheses are only partially confirmed by this study. In order to answer the problems raised, correlation matrices and several regression analysis were used. The results of the regression analysis show that neuroticism is a significant negative predictor of the positive mood and the social relations with the family members, and a significant positive predictor of the negative mood, respiratory and nonrespiratory somatic symptoms; psychoticism is a significant negative predictor of the respiratory somatic symptoms; extraversion does not significantly predict outcome varijables. Also, the tendency to give socially desirable responses has been shown to be a significant negative predictor of the social relations with the loving partners.