Mental health can be defined as the  level of psychological well-being, or an absence of mental illness
Do you know of someone who suffers from a mental illness?
No but I have good knowledge about the subject, for someone to be mentally stable he has to function at a satisfactory level of emotional and behavioural adjustment
It must be hard on people who have a mental illness just to make it through the day.  It must be exhausting.
Yes it is. WHO says that mental health includes subjective well-being, perceived self-efficacy, autonomy, competence, inter-generational dependence amongst others
I've heard that as many as one in five people in America suffer from a mental health illness.  Do you think that other countries are the same?
It's global buddy. A UK surgeon rightly said that mental health is the successful performance of mental function