This dissertation was developed in two studies. The first article investigated the relationship between emotional dysregulation and symptoms of stress, depression and anxiety, assessed using the Emotional Dysregulation Scale-Child and Adolescent Version (EDE-IJ), the Anxiety Symptoms Questionnaire (QSA) and the Depression, Anxiety and Stress Scale (DASS-21), in 63 Brazilian adolescents. The results showed that the paralysis factor (EDE-IJ) presented stronger correlations with anxiety symptoms (r equals 0.726). The pessimism factor (EDE-IJ) demonstrated moderate to strong correlations with anxiety, depression and stress (QSA; DASS-21), being stronger with depression (r equals 0.633). Multiple linear regression analysis showed that the shutdown (EDE-IJ) impacted anxiety symptoms (QSA) (Beta equals 0.693; p is less than 0.001) and the pessimism factor (EDE-IJ) was the only one that explained anxiety symptoms measured by DASS-21 (F(1, 61) equals 11.655, p is less than 0.001; adjusted R2 equals 0.147). The only factor that explained depression symptoms (DASS-21) was pessimism (F(1, 61) equals 40.714, p is less than 0.001; adjusted R2 equals 0.390). The second article presented the effects of an intervention based on Cognitive Behavioral Group Therapy for the development of socioemotional skills in 24 adolescents. The Experimental Group showed significant improvement in the post-intervention period in the fact of paralysis (F equals 8.108; p equals 0.009) and marginally significant in the coping item (F equals 3.823; p equals 0.063), factors measured by EDE-IJ. Theresults of this dissertation highlight the importance of developing emotional regulation skills to prevent mental health problems in adolescence.