‘Lifestyles diseases and rehabilitation’ is a module within the domain of health psychology. Health and illness are influenced by a wide variety of factors. While contagious and hereditary illness are common, there are many behavioral and psychological factors that can impact overall physical well-being and various medical conditions. Health psychology is a specialty area that focuses on how biology, psychology, behavior and social factors influence health and illness. Other terms including medical psychology and behavioral medicine are sometimes used interchangeably with the term health psychology.