The purpose of this study was to evaluate whether there were differentiation of personality characteristics between chronic primary and secondary pain patients. We used egogram questionnaire to evaluate the personality characteristics. One hundred and two patients were enrolled, and seven patients were excluded. Patients were classified into primary and secondary pain according to ICD-11 and statistic analysis was performed about the each ego state. Free child (FC) ego state was statistically lower in chronic primary pain patients than chronic secondary pain patients. Therefore, chronic primary pain patients tend to repress themselves and put others first. For patients with chronic primary pain, interventions to enhance FC, such as building a doctor-patient relationship that allows patients to openly express their thoughts and feelings, assisting the patient to enjoy entertainment and hobbies that help strengthen the reward system and relieve daily stress may be useful as a treatment for pain.