The main concern of this chapter is to discuss evaluation of pediatric pain patient. Evaluating pediatric pain is much more difficult to assess than that of an adult, leading to untreated or undertreated pain with negative effects on quality of life. This results in social, economic and emotional consequences for both the child and the parents. Pain can involve both peripheral and central pathways accompanied by emotional factors and could be somatic, visceral, neuropathic, or neoplastic. Pain perception starts around the third trimester with different perception related to the maturity of the central nervous system. Hence, exposure to pain in early stages of life could be detrimental, leading to changes in the social and emotional aspects. A well-illustrated flowchart related to the evaluation of pediatric pain patient, and two well-colored figures related to pediatric pain questionnaire and faces scale are also provided in this chapter.