Abstract
There exists a diversity of opinions as to the definition of chronic pain, but one of its essential features seems to be the absence of adequate physical findings to account for the complant of pain or resulting social impairment. In this paper, 3 cases of chronic pain are presented and the role of behavioral therapy are discussed in the context of evaluation and treatment for chronic pain. At the standpoint of behavioral theory, the following factors may play causative roles in the pain behaviors of chronic pain patients. (1) Respondent pain behavrio (2) Operant pain behavior (3) Cognitive pain behavior. In clinical settings, all of these three factors are related to each other and complicated at various degrees in the pathogenesis of chronic pain patients. It is absolutely impoptant to apply for appropriate behavioral techniques selected on the basis of detailed behavioral analysis.