The Effectiveness of Cancer Pain Management in Siriraj Outpatient Pain Clinic

* Objectives:Primary outcome is study the effectiveness of new approach and closed follow up system by relief pain intensity 30% at 3 month up to 80% of all new cancer pain patients in OPD setting Secondary outcomes are quality of life (BPI,ESAS), side effect of treatments and the contributing factors that impact on the outcomes * Study design:A prospective observational study * Sample size : 150 * Data collection: General information: age, gender, body weight, height, religion, residence, care giver, occupation, income, education, medical problem Clinical pain information: primary diagnosis, staging, cancer site, current medications Clinical assessment: at three study time points: baseline (initial assessment) and the three subsequent follow-ups (FU1, FU2 and FU3)