Mental health refers to a person's emotional, social, and psychological wellbeing. Mental health is as important as physical health to a full, active lifestyle.
It is harder to define mental health than physical health, because, in many cases, diagnosis depends on the individual's perception of their experience. With improvements in testing, however, some signs of some types of mental illness are now becoming "visible" in CT scans and genetic testing.
Mental health is not only the absence of depression, anxiety, or another disorder.
This means that health is a resource to support an individual's function in wider society. A healthful lifestyle provides the means to lead a full life.