Objective : This case report aims to show the effect of Oryeong-san on dysmenorrhea. the patient was diagnosed with Taeyang-byung based on Shanghanlun provisions.

Methods : According to Diagnostic system based on Shanghanlun provisions, the patient was diagnosed with Taeyang-byung and has over-worked since she had been sick. So she took Oryeong-san decoction for 1 month. We evaluated the results of treatment by Visual Analogue Scale and Moos Menstrual Questionnaire.

Results : After taking Oryeong-san decoction for 1 month, the symptoms of patients improved.

Conclusions : This case report sowed and effectiveness of using Oryeong-san according to Diagnostic system based on Shanghanlun provisions on dysmenorrhea.

KeyWords : Dysmenorrhea, Oryeong-san(五苓散), Diagnostic system based on Shanghanlun provisions, Taeyang-byung(大陽病)