Playing online, surfing, or chatting - what starts as a pastime or hobby can spiral out of control. When constant online presence leads people to neglect their real lives - friends, work, sleep, and nutrition - the internet has become a life-threatening problem. Holger Feindel describes how to distinguish online addiction from normal internet use, who is particularly at risk, and which treatments are effective. With many illustrative case studies and concrete suggestions, he guides those affected and their families back to real life. Includes practical tips for both individuals and their loved ones.