A Trial for Evaluation of Clinical Efficacy and Safety of Healing Stone Navel Belt in Patients With Primary Dysmenorrhea

Inclusion Criteria: * Age : female adults aged 15\~45 years * Subjects should diagnosed as primary dysmenorrhea, should have a primary dysmenorrhea at least a 1-day during menstrual. * Subjects should have 21\~42 days menstrual cycle. * menstrual pain : primary dysmenorrhea at least a 1-day during menstruation is over 5 VAS(Visual Analogue Scale) without drug. * Subjects must have no Serious internal medicine. * Subjects must provide signed informed consent prior to participation in any study-related procedures Exclusion Criteria: * Subject that oral contraceptive taken within 3 months * Pregnancy or lactation. * Subject have contraceptive that secrete hormone. * Secondary dysmenorrhea * pelvis inflammatory disease patient * Other diseases or characteristics judged by the investigator to be incompatible with the assessments needed in this study or with reliable instillation of the study.