1. Objectives This study was designed to investigate the effect of Yanggyuksanhwa-tang(凉膈散火湯) to twelve hyperhidrosis patients. 2. Methods From May, 2008 to August, 2010, we treated hyperhidrosis patients with Yanggyuksanhwa-tang(凉膈散火湯). We survey demographic characters, symptoms of patients and efficacy of Yanggyuksanhwa-tang(凉膈散火湯). 3. Results 1) Twenties, thirties and males were more suffer from hyperhidrosis. 2) The patients who had dysuria got treatment efficacy negatively. 3) Treatment efficacy was affected by number of herbal medicine positively. 4. Conclusions This study shows that Yanggyuksanhwa-tang(凉膈散火湯) has effect to hyperhidrosis in Soeyangin. Treatment efficacy was affected by number of herbal medicine significantly.