Therefore, we will conduct the RCT of using pain education by video comparing to conventional face to face pain education by nurse in hospitalized cancer pain patients.We will use 25 MCQs examination for testing pre-post intervention to test level of understanding of patients. The measurements are NRS, ThaiHADs and FACT-G at the first and last day of study. We expect that NRS should improve more than 50% at the seven day of study.