Abstract
This case series present four patients, who were suffered from chest discomfort due to various underlying disease improved by korean traditional herbal medicine Haewoolhwajoongtang. Four patients in this study with chest discomfort due to various underlying disease in terms of the Western Medicine. But these four patients all have chest discomfort worsened at night caused by 'Yure(鬱熱)'. We treated this four patient by korean herbal medicine Haewoolhwajoong-tang. After treatment, their chief complains that chest discomfort was almost reduced. These result suggests that Haewoolhwajoong-tang was effective on chest discomfort caused by 'Yure(鬱熱)'.