As with other disease, early interventions to this comorbidity could obviously have a significant impact on disease prognosis. The severity of pain is correlated with the severity of depression and its resistance to treatment. Also, neglected depression itself hinders the patients' will to rehabilitate, and inhibit breaking out of the vicious circle of pain and disability [23].

However, in Korea, the entry barrier to meeting a psychiatrist is still high, not because of prejudices towards mental illness among patients, but because of the ignorance of some doctors who treat pain. Things have improved a lot in recent years, but still only fewer than half of the patients who were diagnosed with a mental illness are treated [4]. Most chronic pain patients who are counseled to receive mental support do not yet want to go to a psychiatric clinic. So in my case, I've had to become an unofficial psychiatrist, because my patients also do not want to visit a real one, no matter how much I urge them. Actually, social stigma regarding mental illness is a worldwide problem these days. What's even worse, there are no validated screening tools for comorbid pain and depression [5].

Moreover, the fact that the improvement of depression does not directly improve pain makes clinicians hesitate to give good advice about mental health care [3].

In this issue of The Korean journal of Pain, Lee et al. [6] present an article about the prevalence of unrecognized depression in chronic pain patients. To my knowledge, it is the first report about the prevalence of depression in chronic pain patients in Korea from the clinicians' point of view. Even if it is just a single center study, I hope this research can be a start in letting Korean people know how many chronic pain patients are suffering from depression. And I'm looking forward future multi-center studies with excitement.