The Reality of Mental Illness

My three main points are: Mental disease is a metaphor, but mental illness is not. Feeling ill and having a physical illness are logically related. If there were no such thing as feeling ill, there would be no such thing as suffering from a physical illness. Yet there is no logical connection between feeling ill and being mentally ill. Mental illness is manifested in various forms of behaviour, for example, suspiciousness, elation, depression, etc.; if a form of behaviour is to count as mental illness, it has to be an insane form; yet it is possible to be mentally ill without being insane and it is possible to be insane without being mentally ill