Despite being such a significant part of human experience and everyday life, much about mental health remains a mystery. Mental health encompasses how someone feels, acts, interacts with other people, perceives the world, and thinks. There are many different disorders that can shape mental health, as well as lifestyle choices one can make to improve or degrade their mental health. In recent decades scientific and medical research has enabled more to be understood about mental health, but many questions remain. This volume explores various aspects of mental health, including the factors that help shape it, lifestyle choices and treatments that may help improve it, and the research being done by scientists and doctors to offer a clearer understanding of mental health.