Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Youth Health is the range of approaches to preventing, detecting or treating young people''s health and well being (WHO, 2001). The term adolescent and young people are often used interchangeably, as are the terms Adolescent Health and Youth Health. Young people''s health is of often complex and requires a comprehensive, biopsychosocial approach (NSW Health, 1998). Young people engage in risky behaviours that affect their health and therefore the majority of health problems are psychosocial. Many young people experience multiple problems. These behaviours are established as a young person and go on to become the lifestyles of adults leading to chronic health problems. Social, cultural and environmental factors are all important (Chown et al. 2004). Young people have specific health problems and developmental needs that differ from those of children or adults: The causes of ill-health in adolescents are mostly psychosocial rather biological.