This article studies the multidimensional phenomenon of school bullying, which has increasingly emerged within schools in recent years. In this context, the concept of school bullying and the forms in which it is expressed in the school environment are discussed. There follows a presentation of the consequences on the victimized students in terms of their psychosocial development and their school image, identifying the characteristics they appear, in an attempt to point out that these effects are long-term for their mental health all the way through to adulthood. Finally, reference is made to the role of school in preventing the phenomenon and establishing an environment that supports and empowers the recipients of bullying incidents, so that they do not feel insecure.