|Chronic Illness (Photo credit: eyejammy)|
Believing a theory that states AS LONG AS you are mentally happy, you will be physically healthy, by my opinion, is a modern superstition very likely caused by the overwhelmingly futile treatment of modern medicine. Let me temporarily call this theory as "absolute causality between body and mind". When modern medicine cannot find anything wrong with patients, they usually "suggest" psychological reasons. And this "suggestion" gradually became "belief" because of people's blind trust to science, such as modern medicine and modern psychology, which both are young and far away from complete understanding our body and mind.
FACT is, so many people who got cancers or other fatal diseases were/are not at all unhappy people, and many mentally ill people can also be physically healthy.
The harm this seemingly unharmful belief does to our societies is, that many people who suffer from serious physical unknown illnesses would get wrong treatments, and further more, they are easily discriminated by others, who think they deserve what they suffer.