What is mental health,mental illness,physical health and phy

mental health is different from physical health which we can see and feel it directly。 mental health is a state of our inner heart,whether we are positive,active or depressed or feel blue。mental illness includes melancholia (忧郁症),obsession（强迫症） and so on 。physical health refers to that if your body can work healthily , normally , efficiently。physical illness includes cold,flu,injury,wound in an accident or other kind of illness。