Adolescence is characterized as a transitional period between childhood and adulthood that involves developmental changes in the physical, psychological, social and neurobiological domains. During this phase of life, there are several physical and emotional events regulated by neurohormones which are fundamental for human development, responsible for changes in thoughts, attitudes, and body size and composition which culminate in complete maturity for a laborious and reproductive life. In addition, the necessary insertion in the social environment has great influence on living with family and peer groups, which will help to shape the individual. This article presents some physical, emotional and social characteristics involved in the adolescent's growth and development process, seeking to highlight the aspects directly related to the vulnerability of human beings in their second decade of life.