Many of the United States' top health problems - including heart attack, stroke, and complications from type 2 diabetes - are relatively uncommon among teens and young adults. There are, however, a number of health risks that are of particular concern for individuals between the ages of 13 and 25. Many behaviors this age group is likely to participate in - from listening to loud music to vaping to constantly using smartphones - can have a profound impact on their health. This book examines these threats to teen health using a top-to-bottom organization that focuses on particular parts of the body and systems. Offers background information on the anatomy and function of each part or system before diving into the issues most pertinent to teens. Readers will discover how these threats arise, how they can affect health now and in the future, and what can be done to prevent, treat, or minimize the impact of these threats. Includes accessible further readings for additional research.