The vital importance of the mental health of a nation for the overall well being of the population and socioeconomic development is increasingly recognized. In Malaysia, psychiatric disorders were responsible for 8.6% of the total Disability Adjusted Life Years and were ranked fourth as the leading cause of burden of disease by disease categories. More and more evidence shows that physical illnesses are strongly associated with psychiatric disorders. Those with physical illnesses have much higher risk of developing psychiatric disorders compared to that without. The mechanisms of co-morbidity of psychiatric and physical illness are complex. It is a two-way interaction and there are five different possible ways to describe this.