Defining Mental illness

DEFINING MENTAL ILLNESS
"Abnormal" means to deviate from what is usual
or from some sort of standard. The problem lies
in establishing a standard". C. Flanagan

Mental illness is almost impossible to define as what may be considered 'normal' in one society wouldn't be accepted as such, in another. What is common at a certain age or in a certain context/culture is not universal. An example of this would be walking around naked in public you would considered...