E-health communities, also called Web-based health communities, have become popular arenas for support and sharing of experience, knowledge and advice among patients and citizens. E-health communities are used on a day-to-day basis by people who help each other cope with different health conditions and learn together about health-related issues and behaviors. E-Health Communities and Online Self-Help Groups: Applications and Usage will aim to provide relevant theoretical frameworks and the latest empirical research findings in the area. It aims to increase knowledge and understanding of applications and usage of e-health communities for self-help groups who struggle with health disorders, disabilities, lifestyle issues and other health concerns. Different e-health community settings will be presented, observations of community usage and effects discussed, and complementing ways to measure effectiveness will be introduced and analyzed.